keep (or lose) one's temper

生气时（没能）保持镇定克制不发作

lose one's temper的近义词短语有get cross

例句:

她使出所有的耐心不让自己发怒失控。

It took all her patience to keep her temper.

他虽然很生气但还是忍住怒火了。

He was very annoyed but he kept his temper.

当学生连一个基本的问题都答不上来时，教授终于忍不住火了。

The professor finally lost his temper when the student didn't know the answer to a very elementary question。

他开始发飙了朝我大嚷大叫。

He lost his temper and shouted at me.

Get cross: 发火生气，相当于lose sb's temper

没有必要对超出自己可控范围的事情动气。

It's no point to get cross about something that is out of your control.

Get across: 传达，某事被理解被接受

注：一个字母之差，意思完全变化，英语就是这么灵活。

我们需要尽快将这个关键信息传递给整个团队。

We need to get this key message across to the whole team ASAP.

Quick temper：脾气躁，易怒

比如在连续剧权力游戏中斯塔克们脾气暴躁脑子又转得慢。难怪被杀了。

The Starks in Game Of Thrones have quick tempers and slow minds。 No wonder they got killed.