lifetime的釋義：
n.一生;終身;有生之年;(某物的)存在期，壽命，使用期限
復數： lifetimes
例句：
Works of art are in trust to us during our lifetime.
藝術品交由我們托管一生。
I want to take advantage of your lifetime of scholarship.
我希望能夠用到您一生的學識。
During my lifetime I haven't got around to much travelling.
我一生中沒怎么去旅行過。
You've given a lifetime of service to athletics
你為田徑運動貢獻了一生。
Say's writings reached a wide audience during his lifetime
在塞伊有生之年，他的作品擁有大量的讀者。