「敲响警钟」英文怎么说？

a wake up call 

1. 电话叫醒服务

2. 敲响警钟、提醒、警钟、警告

Your cholesterol level is way too high. That is a wake up call for you. It is time to seriously change your diet. 

你的胆固醇指标太高了，这是给你的警告，是时候该好好调整你的饮食结构了。

This is a wake up call for him. He really shouldn't have done that to people around him. 

这是给他的一个警告，他真不应该对身边人做出那样的事情。