In schools, teachers and pupils alike often assume that if a concept has been easy to learn, then the lesson has been successful.

在学校里，老师和学生都认为如果很容易学会一个概念，那么这堂课就是成功的。

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In this lesson, students learn how to surf the internet safely and effectively.

在这节课中，学生们学习如何安全有效地上网。

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I guess I should recognize my mistakes and learn the lesson they teach me and move forward.

我想我应该认识到我的错误，吸取教训，并继续前进。

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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

The way Jobs walked around the stage freely, comfortably and relaxed is a lesson that everyone should learn and follow.

FORBES: Why Steve Jobs Was The Ultimate Communicator

So another possibility, suggests Mark Kiesel of PIMCO, an American bond-investment firm, is that hedge funds and dealers will have their wrists badly smacked, learn a lesson and dedicate themselves henceforth to fundamental credit analysis and due diligence.

ECONOMIST: Buttonwood

"I hope that Ali Abdullah Saleh and his regime learn a lesson from what happened to Gadhafi and his government, " said Mohammed Abulahoum, head of Yemen's opposition Justice and Development Party.

CNN: Syria, Yemen opposition warn dictators: You're next