the ending of the fixed period for which a contract is valid
期满;(合同的)有效期终止
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the expiration of the lease .租约有效期的终止。
the end of a period of time
(一段时间的)结束,终止
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the expiration of three years .三年时间的结束。
〈技〉 呼气,吐气。
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expirationn.期满;有效期终止;呼气;吐气;结束;终止
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explorationn.探险;考察;探测;勘探;详尽分析;探索探究
"late Middle English (denoting a vapour or exhalation): from Latin