lifetime

一生、一辈子、终身

She spent her whole lifetime helping children in poor villages.

她一辈子都在帮助贫穷村落里的孩子。

使用寿命、年限

The battery has a lifetime of about five years.

这颗电池的使用寿命大约是五年。

很久、漫长的时间口语

Waiting for the results felt like a lifetime.

等结果的那段时间感觉像过了一辈子那么久。

难得的机会、千载难逢常用于 of a lifetime

Studying abroad for a year was the chance of a lifetime.

出国留学一年是千载难逢的机会。

终身的、一辈子的

The product comes with a lifetime warranty against defects.

这项产品提供瑕疵终身保固。