1.stay up 深夜不睡；熬夜

例句：You've got school tomorrow. I don't want you staying up late.

你明天要上学。我不想让你熬夜。

2.pass out 昏迷；失去知觉

例句：She passed out when she heard the bad news.

她听到这噩耗后晕了过去。

3.crack up

1.(因压力造成身体或精神)垮掉,崩溃

例句：You'll crack up if you carry on working like this.

你再这样干下去,身体会垮掉的。

2.开始大笑起来

例句：He walked in and everyone just cracked up.

他一进来,人人都捧腹大笑起来。

crack sb up 使大笑起来

Gill's so funny, she just cracks me up.

吉尔滑稽极了,逗得我哈哈大笑。

4.fall out 发生；脱落；争吵；离队；结果是

例句：Some of them fell out from fatigue.

他们中的几位由于疲劳而掉队。