lesson|lessons

这次悲惨事故对所有父母来说都是一个教训。

There is a ___lesson for all parents in this tragic accident.

我父母让我还清了所有钱，这是一个我永远不会忘记的教训。

My parents made me pay back all the money, and it was a ___lesson I never forgot.

我们可以从这场灾难中学到重要的教训。

We can learn important ___lessons from this disaster.

我再也不带伞出去了——我已经吸取教训了！

I'm not going out without my umbrella again - I've learnt my ___lesson!

她吸取了教训，再也不会在考试前出去了。

She learnt her ___lesson and she won't go out before an exam any more.

如果你不吸取教训，你会继续犯同样的错误。

If you don't learn your ___lesson, you'll keep making the same mistakes.