1.Calm down! Don't get so agitated.冷静下来！别那么激动。

2.He just needs to calm down a wee bit.他只是需要稍微冷静一下。

3.Look, calm down! We'll find her.喂，镇静一点！我们会找到她的。

4.As the music began, I took a deep breath and tried to calm down.音乐开始时,我深深地吸了一口气,试图平静下来。