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N-COUNT
一生；終生
A lifetime is the length of time that someone is alive.
例句
During my lifetime I haven't got around to much travelling.
我一生中沒怎么去旅行過。
...a trust fund to be administered throughout his wife's lifetime.
為他妻子終生管理的信托基金
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N-SING
（事物的）存在期，使用期
The lifetime of a particular thing is the period of time that it lasts.
例句
...the lifetime of a parliament.
議會(huì)的屆期
...a satellite's lifetime.
衛(wèi)星的使用期
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PHRASE
終生難遇的；千載難逢的
If you describe something as the chance or experience of a lifetime, you are emphasizing that it is the best or most important chance or experience that you are ever likely to have.
例句
This could be not just the trip of a lifetime but the experience of a lifetime.
這可能不僅是一趟終生難遇的旅行，也將是一次終生難遇的體驗(yàn)。