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<!-- Created: Fri Mar 27 13:15:30 UTC 2026 -->
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        <link:definition>995321 - Disclosure - Property and Equipment, Net</link:definition>
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        <link:definition>995322 - Disclosure - Lease</link:definition>
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        <link:definition>995323 - Disclosure - Intangible Assets, Net</link:definition>
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        <link:definition>995324 - Disclosure - Other Investments</link:definition>
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        <link:definition>995325 - Disclosure - Accounts Payable, Accrued Expenses and Other Liabilities</link:definition>
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        <link:definition>995326 - Disclosure - Bank Borrowings</link:definition>
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        <link:definition>995327 - Disclosure - Related Party Transactions</link:definition>
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        <link:definition>995328 - Disclosure - Commitments and Contingencies</link:definition>
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        <link:definition>995329 - Disclosure - Restricted Net Assets</link:definition>
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        <link:definition>995331 - Disclosure - Additional Information: Condensed Financial Statements of the Company</link:definition>
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        <link:definition>996000 - Disclosure - Accounting Policies, by Policy (Policies)</link:definition>
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        <link:definition>996001 - Disclosure - Organization and Principal Activities (Tables)</link:definition>
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        <link:definition>996002 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
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        <link:definition>996003 - Disclosure - Revenues (Tables)</link:definition>
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        <link:definition>996004 - Disclosure - Other (Expense)/Income, Net (Tables)</link:definition>
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        <link:definition>996005 - Disclosure - Taxation (Tables)</link:definition>
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        <link:definition>996006 - Disclosure - Share-Based Awards (Tables)</link:definition>
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        <link:definition>996007 - Disclosure - Earnings Per Share (Tables)</link:definition>
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        <link:definition>996008 - Disclosure - Cash and Cash Equivalents (Tables)</link:definition>
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        <link:definition>996009 - Disclosure - Accounts Receivable, Net (Tables)</link:definition>
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        <link:definition>996010 - Disclosure - Inventories, Net (Tables)</link:definition>
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        <link:definition>996011 - Disclosure - Prepayments and Other Assets (Tables)</link:definition>
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        <link:definition>996012 - Disclosure - Long-Term Investments (Tables)</link:definition>
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        <link:definition>996013 - Disclosure - Property and Equipment, Net (Tables)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/LeaseTables" id="ucl_r_LeaseTables">
        <link:definition>996014 - Disclosure - Lease (Tables)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/IntangibleAssetsNetTables" id="ucl_r_IntangibleAssetsNetTables">
        <link:definition>996015 - Disclosure - Intangible Assets, Net (Tables)</link:definition>
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        <link:definition>996016 - Disclosure - Other Investments (Tables)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/AccountsPayableAccruedExpensesandOtherLiabilitiesTables" id="ucl_r_AccountsPayableAccruedExpensesandOtherLiabilitiesTables">
        <link:definition>996017 - Disclosure - Accounts Payable, Accrued Expenses and Other Liabilities (Tables)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/BankBorrowingsTables" id="ucl_r_BankBorrowingsTables">
        <link:definition>996018 - Disclosure - Bank Borrowings (Tables)</link:definition>
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        <link:definition>996019 - Disclosure - Related Party Transactions (Tables)</link:definition>
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        <link:definition>996020 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
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        <link:definition>996021 - Disclosure - Additional Information: Condensed Financial Statements of the Company (Tables)</link:definition>
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        <link:definition>996022 - Disclosure - Organization and Principal Activities - Schedule of Company&#8217;s Principal Subsidiaries (Details)</link:definition>
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        <link:definition>996023 - Disclosure - Summary of Significant Accounting Policies (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ConcentrationandRisksDetails" id="ucl_r_ConcentrationandRisksDetails">
        <link:definition>996027 - Disclosure - Concentration and Risks (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofRevenuesTable" id="ucl_r_ScheduleofRevenuesTable">
        <link:definition>996028 - Disclosure - Revenues - Schedule of Revenues (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofDisaggregationofRevenueTable" id="ucl_r_ScheduleofDisaggregationofRevenueTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofOtherExpenseIncomeNetTable" id="ucl_r_ScheduleofOtherExpenseIncomeNetTable">
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      <link:roleType roleURI="http://www.example.com/role/TaxationDetails" id="ucl_r_TaxationDetails">
        <link:definition>996031 - Disclosure - Taxation (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofIncomebeforeIncomeTaxesTable" id="ucl_r_ScheduleofIncomebeforeIncomeTaxesTable">
        <link:definition>996032 - Disclosure - Taxation - Schedule of Income before Income Taxes (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofPerShareEffectoftheTaxHolidaysTable" id="ucl_r_ScheduleofPerShareEffectoftheTaxHolidaysTable">
        <link:definition>996035 - Disclosure - Taxation - Schedule of Per Share Effect of the Tax Holidays (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofComponentsoftheDeferredTaxAssetsTable" id="ucl_r_ScheduleofComponentsoftheDeferredTaxAssetsTable">
        <link:definition>996036 - Disclosure - Taxation - Schedule of Components of the Deferred Tax Assets (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofMovementofValuationAllowanceTable" id="ucl_r_ScheduleofMovementofValuationAllowanceTable">
        <link:definition>996037 - Disclosure - Taxation - Schedule of Movement of Valuation Allowance (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/OrdinarySharesDetails" id="ucl_r_OrdinarySharesDetails">
        <link:definition>996038 - Disclosure - Ordinary Shares (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ShareBasedAwardsDetails" id="ucl_r_ShareBasedAwardsDetails">
        <link:definition>996039 - Disclosure - Share-Based Awards (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofCompensationExpenseRecognizedforShareBasedAwardsTable" id="ucl_r_ScheduleofCompensationExpenseRecognizedforShareBasedAwardsTable">
        <link:definition>996040 - Disclosure - Share-Based Awards - Schedule of Compensation Expense Recognized for Share-Based Awards (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofRestrictedSharesActivityTable" id="ucl_r_ScheduleofRestrictedSharesActivityTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofChangesintheShareOptionsGrantedTable" id="ucl_r_ScheduleofChangesintheShareOptionsGrantedTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofBasicandDilutedNetEarningsPerShareTable" id="ucl_r_ScheduleofBasicandDilutedNetEarningsPerShareTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofDilutedEarningsPerShareTable" id="ucl_r_ScheduleofDilutedEarningsPerShareTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofCashonHandandCashHeldatBankBalanceAndShortTermDepositTable" id="ucl_r_ScheduleofCashonHandandCashHeldatBankBalanceAndShortTermDepositTable">
        <link:definition>996045 - Disclosure - Cash and Cash Equivalents - Schedule of Cash on Hand and Cash Held at Bank Balance And Short-Term Deposit (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofAccountsReceivableNetTable" id="ucl_r_ScheduleofAccountsReceivableNetTable">
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofPresentsMovementintheAllowanceforDoubtfulAccountsTable" id="ucl_r_ScheduleofPresentsMovementintheAllowanceforDoubtfulAccountsTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofInventoriesNetTable" id="ucl_r_ScheduleofInventoriesNetTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofMovementinWriteDownofObsoleteInventoriesTable" id="ucl_r_ScheduleofMovementinWriteDownofObsoleteInventoriesTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofPrepaymentsandOtherAssetsTable" id="ucl_r_ScheduleofPrepaymentsandOtherAssetsTable">
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      <link:roleType roleURI="http://www.example.com/role/LongTermInvestmentsDetails" id="ucl_r_LongTermInvestmentsDetails">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofLongTermInvestmentsTable" id="ucl_r_ScheduleofLongTermInvestmentsTable">
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      <link:roleType roleURI="http://www.example.com/role/PropertyandEquipmentNetDetails" id="ucl_r_PropertyandEquipmentNetDetails">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofPropertyandEquipmentTable" id="ucl_r_ScheduleofPropertyandEquipmentTable">
        <link:definition>996055 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/LeaseDetails" id="ucl_r_LeaseDetails">
        <link:definition>996056 - Disclosure - Lease (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofBalancesReportedintheConsolidatedBalanceSheetsRelatedtoGroupsLeasesTable" id="ucl_r_ScheduleofBalancesReportedintheConsolidatedBalanceSheetsRelatedtoGroupsLeasesTable">
        <link:definition>996057 - Disclosure - Lease - Schedule of Balances Reported in the Consolidated Balance Sheets Related to Group&#8217;s Leases (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofLeaseCostTable" id="ucl_r_ScheduleofLeaseCostTable">
        <link:definition>996058 - Disclosure - Lease - Schedule of Lease Cost (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofReconcilestheUndiscountedCashFlowsTable" id="ucl_r_ScheduleofReconcilestheUndiscountedCashFlowsTable">
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      <link:roleType roleURI="http://www.example.com/role/IntangibleAssetsNetDetails" id="ucl_r_IntangibleAssetsNetDetails">
        <link:definition>996060 - Disclosure - Intangible Assets, Net (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofEstimatedAggregateAmortizationExpensesTable" id="ucl_r_ScheduleofEstimatedAggregateAmortizationExpensesTable">
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      <link:roleType roleURI="http://www.example.com/role/OtherInvestmentsDetails" id="ucl_r_OtherInvestmentsDetails">
        <link:definition>996063 - Disclosure - Other Investments (Details)</link:definition>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofOtherInvestmentsTable" id="ucl_r_ScheduleofOtherInvestmentsTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofAccountsPayableAccruedExpensesandOtherLiabilitiesTable" id="ucl_r_ScheduleofAccountsPayableAccruedExpensesandOtherLiabilitiesTable">
        <link:definition>996065 - Disclosure - Accounts Payable, Accrued Expenses and Other Liabilities - Schedule of Accounts Payable, Accrued Expenses and Other Liabilities (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/BankBorrowingsDetails" id="ucl_r_BankBorrowingsDetails">
        <link:definition>996066 - Disclosure - Bank Borrowings (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofBankBorrowingsTable" id="ucl_r_ScheduleofBankBorrowingsTable">
        <link:definition>996067 - Disclosure - Bank Borrowings - Schedule of Bank Borrowings (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofRelationshipwithMaterialRelatedPartiesTable" id="ucl_r_ScheduleofRelationshipwithMaterialRelatedPartiesTable">
        <link:definition>996068 - Disclosure - Related Party Transactions - Schedule of Relationship with Material Related Parties (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofRelatedPartyTransactionsTable" id="ucl_r_ScheduleofRelatedPartyTransactionsTable">
        <link:definition>996069 - Disclosure - Related Party Transactions - Schedule of Related Party Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofRelatedPartiesBalancesTable" id="ucl_r_ScheduleofRelatedPartiesBalancesTable">
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofFutureMinimumPurchaseCommitmentRelatedtothePurchaseTable" id="ucl_r_ScheduleofFutureMinimumPurchaseCommitmentRelatedtothePurchaseTable">
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofCommitmentsforLeaseAncillaryServicesFeesTable" id="ucl_r_ScheduleofCommitmentsforLeaseAncillaryServicesFeesTable">
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        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/RestrictedNetAssetsDetails" id="ucl_r_RestrictedNetAssetsDetails">
        <link:definition>996073 - Disclosure - Restricted Net Assets (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/SubsequentEventsDetails" id="ucl_r_SubsequentEventsDetails">
        <link:definition>996074 - Disclosure - Subsequent Events (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofCondensedStatementsofComprehensiveIncomeLossoftheParentCompanyTable" id="ucl_r_ScheduleofCondensedStatementsofComprehensiveIncomeLossoftheParentCompanyTable">
        <link:definition>996075 - Disclosure - Additional Information: Condensed Financial Statements of the Company - Schedule of Condensed Statements of Comprehensive Income/(Loss) of the Parent Company (Details)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType roleURI="http://www.example.com/role/ScheduleofCondensedBalanceSheetsoftheParentCompanyTable" id="ucl_r_ScheduleofCondensedBalanceSheetsoftheParentCompanyTable">
        <link:definition>996076 - Disclosure - Additional Information: Condensed Financial Statements of the Company - Schedule of Condensed Balance Sheets of the Parent Company (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      </link:roleType>
      <link:roleType roleURI="http://www.example.com/role/ScheduleofCondensedStatementofCashFlowsoftheParentCompanyTable" id="ucl_r_ScheduleofCondensedStatementofCashFlowsoftheParentCompanyTable">
        <link:definition>996077 - Disclosure - Additional Information: Condensed Financial Statements of the Company - Schedule of Condensed Statement of Cash Flows of the Parent Company (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.example.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>000 - Document - Document And Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-types/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://fasb.org/srt-types/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/sic/2025" schemaLocation="https://xbrl.sec.gov/sic/2025/sic-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af/2025" schemaLocation="https://xbrl.sec.gov/cyd/2025/cyd-af-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd-sub/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-sub-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei-sub/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-sub-2025.xsd"/>
  <xs:element name="ScheduleOfCompanySPrincipalSubsidiariesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCompanySPrincipalSubsidiariesAbstract"/>
  <xs:element name="ScheduleOfAmortizationOfFiniteLivedIntangibleAssetsOverTheEstimatedUsefulLivesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfAmortizationOfFiniteLivedIntangibleAssetsOverTheEstimatedUsefulLivesAbstract"/>
  <xs:element name="ScheduleOfRevenuesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRevenuesAbstract"/>
  <xs:element name="ScheduleOfDisaggregationOfRevenueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfDisaggregationOfRevenueAbstract"/>
  <xs:element name="ScheduleOfCompensationExpenseRecognizedForShareBasedAwardsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCompensationExpenseRecognizedForShareBasedAwardsAbstract"/>
  <xs:element name="ScheduleOfRestrictedSharesActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRestrictedSharesActivityAbstract"/>
  <xs:element name="ScheduleOfBasicAndDilutedNetEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfBasicAndDilutedNetEarningsPerShareAbstract"/>
  <xs:element name="ScheduleOfDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfDilutedEarningsPerShareAbstract"/>
  <xs:element name="ScheduleOfCashOnHandAndCashHeldAtBankBalanceAndShortTermDepositAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCashOnHandAndCashHeldAtBankBalanceAndShortTermDepositAbstract"/>
  <xs:element name="ScheduleOfMovementInWriteDownOfObsoleteInventoriesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfMovementInWriteDownOfObsoleteInventoriesAbstract"/>
  <xs:element name="ScheduleOfLongTermInvestmentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfLongTermInvestmentsAbstract"/>
  <xs:element name="ScheduleOfPropertyAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfPropertyAndEquipmentAbstract"/>
  <xs:element name="ScheduleOfBalancesReportedInTheConsolidatedBalanceSheetsRelatedToGroupSLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfBalancesReportedInTheConsolidatedBalanceSheetsRelatedToGroupSLeasesAbstract"/>
  <xs:element name="ScheduleOfIntangibleAssetNetAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfIntangibleAssetNetAbstract"/>
  <xs:element name="ScheduleOfBankBorrowingsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfBankBorrowingsAbstract"/>
  <xs:element name="ScheduleOfRelationshipWithMaterialRelatedPartiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRelationshipWithMaterialRelatedPartiesAbstract"/>
  <xs:element name="ScheduleOfRelatedPartyTransactionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRelatedPartyTransactionsAbstract"/>
  <xs:element name="ScheduleOfRelatedPartiesBalancesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRelatedPartiesBalancesAbstract"/>
  <xs:element name="ScheduleOfCommitmentsForLeaseAncillaryServicesFeesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCommitmentsForLeaseAncillaryServicesFeesAbstract"/>
  <xs:element name="ScheduleOfCondensedStatementsOfComprehensiveIncomeLossOfTheParentCompanyAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCondensedStatementsOfComprehensiveIncomeLossOfTheParentCompanyAbstract"/>
  <xs:element name="ScheduleOfCondensedBalanceSheetsOfTheParentCompanyAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCondensedBalanceSheetsOfTheParentCompanyAbstract"/>
  <xs:element name="ScheduleOfCondensedStatementOfCashFlowsOfTheParentCompanyAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfCondensedStatementOfCashFlowsOfTheParentCompanyAbstract"/>
  <xs:element name="RevenueFromProvisionOfDataConnectivityServicesPaasAndSaasServicesAndSalesOfTerminalsAndDataRelatedProductsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_RevenueFromProvisionOfDataConnectivityServicesPaasAndSaasServicesAndSalesOfTerminalsAndDataRelatedProductsAbstract"/>
  <xs:element name="PurchaseOfDataConnectivityServiceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_PurchaseOfDataConnectivityServiceAbstract"/>
  <xs:element name="DepositsReceivedFromRelatedPartiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_DepositsReceivedFromRelatedPartiesAbstract"/>
  <xs:element name="AmountsReceivableFromRelatedPartiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_AmountsReceivableFromRelatedPartiesAbstract"/>
  <xs:element name="ShareOfProfitInEquityMethodInvestmentsNetOfTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ShareOfProfitInEquityMethodInvestmentsNetOfTax"/>
  <xs:element name="OtherInvestmentsCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_OtherInvestmentsCurrent"/>
  <xs:element name="StockIssuedDuringPeriodValueIssuanceUponSubsequentVestingOfRestrictedShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_StockIssuedDuringPeriodValueIssuanceUponSubsequentVestingOfRestrictedShares"/>
  <xs:element name="StockIssuedDuringPeriodSharesIssuanceUponSubsequentVestingOfRestrictedShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_StockIssuedDuringPeriodSharesIssuanceUponSubsequentVestingOfRestrictedShares"/>
  <xs:element name="ImpairmentForInventoryObsolescence" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ImpairmentForInventoryObsolescence"/>
  <xs:element name="IncreaseDecreaseInOperatingLeaseRightofuseAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IncreaseDecreaseInOperatingLeaseRightofuseAssets"/>
  <xs:element name="IncreasedecreaseInShorttermDeposit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IncreasedecreaseInShorttermDeposit"/>
  <xs:element name="CashPaidForAmountsIncludeInOperatingLeaseLiabilities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_CashPaidForAmountsIncludeInOperatingLeaseLiabilities"/>
  <xs:element name="IssuanceUponSubsequentVestingOfRestrictedShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IssuanceUponSubsequentVestingOfRestrictedShares"/>
  <xs:element name="IssuanceOfSharesUponVestingOfRestrictedShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IssuanceOfSharesUponVestingOfRestrictedShares"/>
  <xs:element name="SalesAndMarketingExpensesPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_SalesAndMarketingExpensesPolicyTextBlock"/>
  <xs:element name="GovernmentGrantsPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_GovernmentGrantsPolicyTextBlock"/>
  <xs:element name="ScheduleOfPropertyPlantAndEquipmentTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfPropertyPlantAndEquipmentTableTextBlock"/>
  <xs:element name="ScheduleOfMovementInWriteDownOfObsoleteInventoriesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfMovementInWriteDownOfObsoleteInventoriesTableTextBlock"/>
  <xs:element name="ScheduleOfRelatedPartyTransactionTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRelatedPartyTransactionTableTextBlock"/>
  <xs:element name="ScheduleOfRelatedPartiesBalancesTableTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_ScheduleOfRelatedPartiesBalancesTableTextBlock"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesScheduleofAmortizationofFiniteLivedIntangibleAssetsovertheEstimatedUsefulLivesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_SummaryofSignificantAccountingPoliciesScheduleofAmortizationofFiniteLivedIntangibleAssetsovertheEstimatedUsefulLivesDetailsTable"/>
  <xs:element name="OtherIncomeFromGovernmentGrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_OtherIncomeFromGovernmentGrants"/>
  <xs:element name="EffectiveIncomeTaxRateReconciliationPermanentDifferences" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_EffectiveIncomeTaxRateReconciliationPermanentDifferences"/>
  <xs:element name="IncomeTaxReconciliationTaxHolidaysReversal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IncomeTaxReconciliationTaxHolidaysReversal"/>
  <xs:element name="DeferredTaxAssetsAccruedExpensesAndOthers" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_DeferredTaxAssetsAccruedExpensesAndOthers"/>
  <xs:element name="ShareBasedAwardsScheduleofRestrictedSharesActivityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_ShareBasedAwardsScheduleofRestrictedSharesActivityDetailsTable"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueForfeited" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueForfeited"/>
  <xs:element name="AllowanceForDoubtfulAccountsReceivableAdditions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_AllowanceForDoubtfulAccountsReceivableAdditions"/>
  <xs:element name="ProvisionForDoubtfulAccountsReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ProvisionForDoubtfulAccountsReceivable"/>
  <xs:element name="InventoryAdditions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_InventoryAdditions"/>
  <xs:element name="InventoryWrittenOff" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_InventoryWrittenOff"/>
  <xs:element name="ExchangeRateDifferenceOnInventories" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ExchangeRateDifferenceOnInventories"/>
  <xs:element name="CumulativeNetGainslosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_CumulativeNetGainslosses"/>
  <xs:element name="Impairment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_Impairment"/>
  <xs:element name="InvestmentExchangeDifference" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_InvestmentExchangeDifference"/>
  <xs:element name="AccruedOtherDepositsCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_AccruedOtherDepositsCurrent"/>
  <xs:element name="OtherTaxesPayableCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_OtherTaxesPayableCurrent"/>
  <xs:element name="RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_RelatedPartyTransactionsScheduleofRelatedPartyTransactionsDetailsTable"/>
  <xs:element name="RelatedPartyTransactionsScheduleofRelatedPartiesBalancesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_RelatedPartyTransactionsScheduleofRelatedPartiesBalancesDetailsTable"/>
  <xs:element name="DepositsReceivedFromRelatedParties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="ucl_DepositsReceivedFromRelatedParties"/>
  <xs:element name="PurchaseObligationDueInSecondAndFiveYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_PurchaseObligationDueInSecondAndFiveYear"/>
  <xs:element name="CommitmentsandContingenciesScheduleofCommitmentsforLeaseAncillaryServicesFeesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_CommitmentsandContingenciesScheduleofCommitmentsforLeaseAncillaryServicesFeesDetailsTable"/>
  <xs:element name="CommitmentsandContingenciesScheduleofCommitmentsforLeaseAncillaryServicesFeesDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_CommitmentsandContingenciesScheduleofCommitmentsforLeaseAncillaryServicesFeesDetailsLineItems"/>
  <xs:element name="LesseeOperatingLeaseLiabilityPaymentsDueSecondAndFifthYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_LesseeOperatingLeaseLiabilityPaymentsDueSecondAndFifthYear"/>
  <xs:element name="DeficitInSubsidiariesAndFormerVIEs" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_DeficitInSubsidiariesAndFormerVIEs"/>
  <xs:element name="IntercompanyFundTransfers" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_IntercompanyFundTransfers"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesScheduleofDepreciationonPropertyandEquipmentovertheEstimatedUsefulLivesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_SummaryofSignificantAccountingPoliciesScheduleofDepreciationonPropertyandEquipmentovertheEstimatedUsefulLivesDetailsTable"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_SummaryofSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="ReversalOfInventoryObsolescence" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_ReversalOfInventoryObsolescence"/>
  <xs:element name="ConcentrationandRisksDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_ConcentrationandRisksDetailsTable"/>
  <xs:element name="TaxationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_TaxationDetailsTable"/>
  <xs:element name="CorporateIncomeTaxRate" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_CorporateIncomeTaxRate"/>
  <xs:element name="PreferentialIncomeTaxRate" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_PreferentialIncomeTaxRate"/>
  <xs:element name="PreferentialTaxRateExtensionPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_PreferentialTaxRateExtensionPeriod"/>
  <xs:element name="PurchasedTaxReserve" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_PurchasedTaxReserve"/>
  <xs:element name="LongestCarryoverPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_LongestCarryoverPeriod"/>
  <xs:element name="OrdinarySharesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="ucl_OrdinarySharesDetailsTable"/>
  <xs:element name="CommonStockAuthorizedAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_CommonStockAuthorizedAmount"/>
  <xs:element name="StockIssuedDuringPeriodSharesSubdivided" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_StockIssuedDuringPeriodSharesSubdivided"/>
  <xs:element name="RecastOfSharesParValue" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="ucl_RecastOfSharesParValue"/>
  <xs:element name="OrdinarySharesRedemptionPriceCompoundedAnnualInterestRate" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_OrdinarySharesRedemptionPriceCompoundedAnnualInterestRate"/>
  <xs:element name="StockRepurchasedPricePerShare" type="dtr:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_StockRepurchasedPricePerShare"/>
  <xs:element name="AdjustmentsToAdditionalPaidInCapitalCancellationOfRepurchasedOrdinaryShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_AdjustmentsToAdditionalPaidInCapitalCancellationOfRepurchasedOrdinaryShares"/>
  <xs:element name="CumulativeRevenue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="ucl_CumulativeRevenue"/>
  <xs:element name="StockIssuedDuringPeriodSharesConversionOfPreferredStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_StockIssuedDuringPeriodSharesConversionOfPreferredStock"/>
  <xs:element name="SharesWereIssuedUponExerciseOfOutstandingStockOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_SharesWereIssuedUponExerciseOfOutstandingStockOptions"/>
  <xs:element name="SharesWereIssuedUponVestingOfRestrictedShare" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_SharesWereIssuedUponVestingOfRestrictedShare"/>
  <xs:element name="OrdinarySharesWereIssuedForConvertibleDebenture" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_OrdinarySharesWereIssuedForConvertibleDebenture"/>
  <xs:element name="SharesWereIssuedForConversionOfConvertibleDebenture" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ucl_SharesWereIssuedForConversionOfConvertibleDebenture"/>
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