She became alternately angry and calm.

她时而愤怒时而平静。

youdao

The message has an emotional tone that is authentically sad/fearful/angry and at the same time, is by marked by a rueful calm, by gentleness, and by courage.

这里边有一种真正悲哀/恐惧/愤怒的情绪化腔调，与此同时又带有悔恨的平静、温顺和勇气。

youdao

I'll go and calm your angry brother down.

我去让你生气的兄弟平静下来。

youdao

He stays calm and never gets angry or too excited.

VOA: special.2010.05.02

When he's too passive people say he's lost his passion to compete, and when he's angry and tries to fire himself up they say he's got to calm down and control his frustration.

BBC: Andy Murray knows he can win Wimbledon - Tim Henman

Nationally, gun rights are popular, but so are modest restrictions on them, such as background checks to weed out criminals and crazy people, and waiting periods to allow angry people time to calm down.

ECONOMIST: The Nine strike down a gun ban and delight the firearms lobby

Once I was honest with myself about these factors, and had taken the time to think through why I was so angry, I could have the next two conversations and in a calm, collected way.

FORBES: A Co-Worker Got the Promotion I Wanted -- Now What?