calmv.使平静；使镇静；
calm before the storm暴风雨前的平静；
calm down使平息, 使平静
The main thing is to stay calm.
最重要的是要保持冷静。
There was an air of easy assurance and calm about him.
他表现出从容自信和冷静。
The main thing is to remain calm.
