进口人在汇票到期时才履行付款义务。

Payment will be made when the usance period is due.

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这些衍生品的合约规定，当一批被列入好几个高收益(即垃圾)指数的公司发生亏损时，伯克希尔-哈撒威需要履行其付款义务。

These derivatives require Berkshire to pay when losses occur at companies that are included in several high-yield, or junk, indexes.

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借款人承诺并同意，除非其在本协议项下的所有欠付款项均已全额偿付，否则应履行下列义务。

The Borrower covenants and agrees that, until all amounts owing under this Agreement have been paid in full, it shall perform the following obligation.

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