lessons
A lesson is a fixed period of time when people are taught about a particular subject or taught how to do something.
It would be his last French lesson for months.
这将是他以后几个月里的最后一次法语课。
You use lesson to refer to an experience which acts as a warning to you or an example from which you should learn.
There's still one lesson to be learned from the crisis – we all need to better understand the thinking of the other side.
从危机中还要吸取一个教训–我们都需要更好地理解对方的想法。
teach someone a lesson
If you say that you are going to teach someone a lesson, you mean that you are going to punish them for something that they have done so that they do not do it again.