I kept telling myself to keep calm.

我不断叮嘱自己要保持冷静。

《牛津词典》

It is important to keep calm in an emergency.

情况紧急的时候，保持镇静是重要的。

《牛津词典》

Try to keep calm and just tell me what happened.

试着保持冷静，告诉我发生了什么。

《柯林斯英汉双解大词典》

Abbey Clements tried to keep calm for the sake of her students, she said.

CNN: STORY HIGHLIGHTS

Here are some flimsy reasons for Knicks fans to keep calm: this is a road trip.

WSJ: Knicks Bandwagon Hits a Rough Patch

Trying to keep calm, she joined the multitude pressing for news outside the hospital.

NPR: No Alarm, Only 1 Exit In Brazil Nightclub Fire