keep calm 和calm down的区别是: keep calm 是 : 保持冷静. 例 : Let"s think of someyhing else. It is a good way to kep calm. 让我们想一些其馀的东西,那是个保持冷静的好方法. calm down 是 : 冷静下来. OK, everydbody just calm down now, nothing bad has happened. 好了,大家冷静下来,并没有甚麼坏事情发生! 很高兴能够帮到你,希望会对你有助,并望采纳,谢谢.