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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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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

And afterward, to avoid future Bosnias and future Kosovos, we will learn the lesson of the Marshall Plan and what we did for eastern Europe after the Berlin Wall fell, by working with our European allies to build prosperity and cooperation in southeastern Europe so that there will be stronger forces pulling people together than those that are driving them apart.

CNN: Transcript: Clinton speaks at Memorial Day Event