learn one's lesson 吸取教训
learn one's lesson one's actions 吸取教训
It's a tough lesson to learn: No one listens, everyone thinks they're invincible.
WSJ: Heroes Shine Amid Storm's Destruction
Now, of course, it's time for the Boy Scouts themselves to learn a lesson about adaptability one that I fear may be coming too late to save the group from its long decline in numbers and influence.
WSJ: A Lesson From the Scouts' Own Book
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