until

prep.直到 ... 的时候；在...以前；直到…为止

conj.直到 ... 时候才 ...；在...之前；直到...的程度；直到…为止

The heat did not relax until midnight. 直到半夜，炎热才缓解。

We did not notice this matter until yesterday. 直到昨天我们才注意到这件事。

She can't leave until Friday. 在星期五之前她不能离开。

He put off his departure until his sister came. 他推迟行期,直到他妹妹来了之后才走。

I didn't wake up until I heard the alarm clock. 直到听到闹钟的铃声我才醒来。

I was in the dark about it until she told me. 这件事在她告诉我之前，我毫不知情。

She sticks to the work until it is finished. 她坚持工作,直到把工作完成为止。