lifetime的释义：
n.一生;终身;有生之年;(某物的)存在期，寿命，使用期限
复数： lifetimes
例句：
Works of art are in trust to us during our lifetime.
艺术品交由我们托管一生。
I want to take advantage of your lifetime of scholarship.
我希望能够用到您一生的学识。
During my lifetime I haven't got around to much travelling.
我一生中没怎么去旅行过。
You've given a lifetime of service to athletics
你为田径运动贡献了一生。
Say's writings reached a wide audience during his lifetime
在塞伊有生之年，他的作品拥有大量的读者。