This is an important lesson to learn.

这是我们需要学的很重要的一堂课。

youdao

Lesson to learn: Stop uploading your photos onto the Web.

经验：不要在网上上传自己的照片。

youdao

Lesson to learn: Use fonts carefully or you may regret the results.

教训：用字要小心，否则你会后悔的。

youdao

So what lesson is there to learn from the myth of "The Unsinkable Molly Brown?"

VOA: special.2010.03.08

And this is a hugely important lesson to learn.

这么问自己，这是不是一个隐藏的。

麻省理工公开课 - 计算机科学及编程导论课程节选

General Grant was beginning to learn an important lesson of the war.

VOA: special.2009.11.26

But perhaps there is a lesson to learn from Nickelback on how to be more likeable.

BBC: If used-car salesmen ran Congress

For Friedman, this was a tough lesson to learn, coming from the ego-driven world of television.

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We believe that Africans and our neighbours have a lesson to learn from this wrong crisis management.

BBC: Ethiopian president hails victories