Farmers learn this lesson tragically sometimes when their animals feed on wild plants.

VOA: special.2009.08.25

There is a spiritual lesson that we can learn.

我想从中我们也能学到一些关于灵性的体验。

普林斯顿公开课 - 人性课程节选

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

General Grant was beginning to learn an important lesson of the war.

VOA: special.2009.11.26

Grant was beginning to learn an important lesson of the war.

VOA: special.2009.12.03

These are students who felt under enormous pressure to perform, and I want to underscore the word 'perform,' as opposed to 'learn.'" She says the hardest lesson for society may be that young people will grow up lacking interest in learning.

VOA: special.2011.07.14

But in return,Heller's surfing adventure helped him learn a valuable lesson about catching the perfect wave in life.

VOA: standard.2010.08.04

It was Arabs who did this to other Arabs." Smith believes that is the main lesson American policymakers should learn: that Arabs today are divided against themselves.

VOA: standard.2010.03.18