He recalls a major lesson learned from his own employee.

他想起从他的员工身上学到的重要一课。

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The first lesson learned is that lessons can be learned.

学到的第一课是，教训是可以吸取的。

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One life sacrificed, one lesson learned.

每条无辜牺牲的生命，都给我们人生以教训。

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On Tuesday,Geithner told Congress that the government must have the authority to seize non-bank entities, arguing that massive destabilizing dangers can come from financial institutions - a lesson learned from the rescue of American International Group,or AIG, a giant insurer that received a $180 billion taxpayer bailout.

VOA: standard.2009.03.25

The conclusion of this parable seems so violent perhaps because the lesson to be learned from the parable is so uncertain.

这个故事的结尾看起来太残酷了,可能因为这个寓言想要教给我们的东西太不确定。

耶鲁公开课 - 弥尔顿课程节选

And frankly, even I never quite learned that lesson.

坦白说，即使是我也从没完全记住教训。

哈佛公开课 - 计算机科学课程节选

It was a hard lesson learned, but here it is: Knowledge is not power.

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Lesson learned, says Adam Sohn, a Microsoft executive involved with both Passport and .

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Lesson learned for all parties involved passwords are changed, Ipad put away, and life moves on.

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