expire相关的词根或词缀是: spir

第三人称单数： expires
过去式： expired
过去分词： expired
现在分词： expiring

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Both will expire at the end of the year .

这两项政策将于今年底到期。

If the bush tax cuts expire completely , that advantage would disappear .

如果布什政府的减税政策完全终止的话，这一优势会随之消失。

The decision came less than three hours before the mandate was to expire .

这一决定是在授权满期前不到三个小时的时候作出的。

Some firms have decided not to sign up , even though that means they will probably lose their concessions when they expire .

一些公司决定不签订这类合同，即便这意味着他们将可能失去在合同期满时的优惠。

Those tax cuts expire at year 's end .

原来的减税措施将于今年底到期。