This ought to be a lesson to grave robbers!

这是给盗墓者的一个教训！

youdao

Perhaps the most important lesson to be learned is that you simply cannot please everyone.

或许应吸取的最重要的教训是你不可能取悦每一个人。

《柯林斯英汉双解大词典》

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。

《柯林斯英汉双解大词典》

"It is a lesson to many countries to open up and have far more cultural exchange and make that a priority for diplomacy.

VOA: special.2010.06.21

The conclusion of this parable seems so violent perhaps because the lesson to be learned from the parable is so uncertain.

这个故事的结尾看起来太残酷了,可能因为这个寓言想要教给我们的东西太不确定。

耶鲁公开课 - 弥尔顿课程节选

But he invokes it to show that if one really reads it carefully enough, one can see that the lesson to be drawn has nothing whatsoever to do with the due and timely investment of one's talent.

他为了证明如果一个人足够认真的读过，他就可以看出其实这个寓言的意义与,准时和适时投资都没有关系。

耶鲁公开课 - 弥尔顿课程节选

The lesson to be drawn: donors give to charity for reasons that go beyond tax breaks.

FORBES: The Fiscal Cliff Deal: Charity Takes a Hit

"This is a very tragic case with a lesson to be learnt, " said Mr Howes.

BBC: Pills and bottle

The lesson to be learned is not to kill the goose that lays the golden eggs.

FORBES: What's Choking Bank Lending?