We can learn a lesson from the story.

我们可以从这个故事中吸取教训。

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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。

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I hope they learn a lesson from this.

我希望他们能从中得到教训。

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Facebook did seem to learn a lesson from the December 2009 privacy debacle.

FORBES: Facebook and FTC Close To Reaching A Settlement Over A 2009 Privacy Complaint

If I am to learn a lesson from this misadventure, it is that a cheap stock can always get cheaper and that it pays to cut your losses early.

FORBES: Best And Worst Trades Of 2011

Science editor Alan Boyle's blog: Researcher Jared Diamond, the author of "The World Until Yesterday, " says Congress could learn a lesson from tribal societies: Listen to your elders.

MSN: Massive meteorite crater found in Canadian Arctic