while

They arrived while we were having dinner.

他们来时我们正在吃饭。

While she was asleep, thieves broke in and stole her handbag.

她睡着的时候，小偷闯进来偷走了她的手提包。

She met Andy while working on a production of Carmen.

排练《卡门》时，她认识了安迪。