calm的解释
n. 平稳,风平浪静
a. 平静的,冷静的
v. 平静下来,镇静
calm的例句
It was a beautiful morning, calm and serene.
那是一个宁静、明媚的早晨。

You should keep calm even in face of danger.
即使面临危险，你也应当保持镇静。