We should learn a lesson from our mistakes so as to be a better person in the future.

我们要从错误中吸取教训，以便在将来成为更好的人。

Let's hope they learn a lesson.

希望他们能从中吸取教训。

Today, I learn a lesson about love.

今天，我上了一节关于爱的课。

I hope they learn a lesson from this.

我希望他们能从中得到教训。

We should learn a lesson from our mistakes.

我们要从错误中吸取教训。