keep calm
US /kiːp kɑːm/
UK /kiːp kɑːm/

1.
保持冷静, 保持镇定
to remain relaxed and not get excited or worried
:
•
No matter what happens, just keep calm and carry on.
无论发生什么,只要保持冷静,继续前进。
•
It's important to keep calm during an emergency.
在紧急情况下保持冷静很重要。