To become invalid after a set time.

• Used of documents, policies, licenses, or offers.

在规定时间后失效。

• 用于证件、保单、许可证或优惠。

To die; to pass away. (formal)

• Euphemistic or literary use.

断气；去世。（书面）

• 委婉或文学用法。

To come to an end.

• Of a period, term, or time limit.

告终；结束。

• 指期限、学期或一段时间。

To breathe out; to exhale.

• To let air out of the lungs.

呼出；吐气。

• 将肺中的空气呼出。

To emit gradually as vapor or gas.

• To give off in minute particles.

逐渐以蒸汽或气体形式散发。

• 以微小颗粒释放。

To cause to become invalid; to terminate. (technical)

• To set an item to expire.

使失效；终止。（技术语）

• 将某项设置为到期。