Calm down, buddy [old chap]. What's the trouble?(压压气，老兄。有什么麻烦吗？)
Otherwise, calm down and go home – please.(否则，请你们冷静下来，回到家里去。)
If you're mad, give yourself time to calm down.(如果你快气疯了，给自己时间冷静下来。)
Please calm down and tell me what's wrong.(请冷静下来告诉我发生什么事了。)
Calm down! Can't you see he's only winding you up?(别激动！难道你看不出他只是在气你吗？)
This critic generated I think some undue rivalry between ballet and modern dance, and it would take a long time, many years in fact, for the rivalry to calm down.(我认为这个评论家造成了在芭蕾和现代舞之间的一些过度竞争，而且需要很长时间（实际上是很多年），才能平息这种竞争。)
We will go back to normal when things calm down.(一切平息下来后，我们将恢复正常。)
Just try to calm down.(试着让自己平静下来！)
OK, let's calm down for several days.(好吧，我们冷静几天吧。)
