a period of time in which a person is taught about a subject or how to do something

How can we make science lessons more interesting? 我们怎样才能把理科课程讲得更有趣一些呢?

She has never had/taken any acting lessons. 她从未上过表演课。

He gives French lessons. 他教法语课。

an experience that teaches you how to behave better in a similar situation in the future

There is a lesson for all parents in this tragic accident. 所有父母都应该从这起悲剧性事件中吸取教训。

My parents made me pay back all the money and it was a lesson I never forgot. 我父母让我把钱都还了回去，这次教训我永远都不会忘记。

We can learn important lessons (= gain new understanding) from this disaster. 从这次灾难中我们可以汲取重要教训。