Keep calm. You shouldn't lose your composure.

"保持镇静,不要惊慌。"

Thousands of panick-stricken residents slept on the streets.

数千人惊慌的居人睡在大街上。

The crowd panicked at the sound of the guns.

枪炮声使群众惊慌。

Panic took hold of him and he couldn’t move.

惊慌，动弹不得。

For a nurse, calming the fears of anxious relatives is all in a day’s work.

对于士来说，安慰惊慌的分内的事。

He was dismayed when he found his wallet gone.

发现丢了钱包而惊慌。

The men set off in fear and trepidation.

这群人惊慌地出发了。

Whatever may betide, maintain your courage.

无论发生什么事, 都不要惊慌。

Don't lose your head.

别惊慌。