合同债务是涉外合同之债。涉外合同之债是根据涉外合同所产生的债权债务关系。涉外合同是发生涉外之债的主要根据，涉外合同之债是涉外之债的主要部分。涉外合同之债是一种非常复杂的债权债务关系，当事人在涉外合同中约定自己的债权和债务时，对合同之债的特点应予通盘的、全面的考虑。
一个人无须对他在未成年时期的合同债务承担责任。
A person is not liable for debts contracted during his minority.
它只是偿还的另一种形式，因债务人无法偿还合同债务。
It is merely an alternative form of repayment by the debtor for the debt he contracted.
合同债务经债权人同意，通过与第三人协议，将其合同义务全部或部分转移给第三人承担。
A person cannot generally transfer his obligations under a contract to another without the consent of the other party and the assignee.
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