Lessons learned from the past can guide one in the future.

前事不忘，后事之师。

《新英汉大辞典》

The lessons learned at the cost of blood helped to sober us.

血的教训使我们的头脑清醒了。

《新英汉大辞典》

I tried to capture "lessons learned" in my essays.

我努力地在文中捕捉那些学到地经验。

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And for a community of practitioners to benefit from the lessons learned from other people so that we can do better the next time around, collectively as a field, and individually as organizations and practitioners."

VOA: special.2010.09.20

So the lessons to be learned, after years of watching this, is that the norm is change.

因此在观察许多年后，我发现了经验，改变是一种常态。

普林斯顿公开课 - 领导能力简介课程节选

Admiral Mullen says while comparisons between Iraq and Afghanistan are not perfect, some lessons learned in Iraq in recent years can apply.

VOA: standard.2009.11.04

Document this step so the lessons learned and the safeguards setup can always go beyond you.

FORBES: Good Employees Make Mistakes. Great Leaders Allow Them To.

"I'm sure there will be lessons learned, " said Tom Kauffman, at the institute in Washington.

WSJ: Nuclear Industry Likely to Reassess Safety Systems

They consider the lessons learned and make the necessary improvements to ride one more time.

FORBES: How Business Champions Overcome Adversity: 5 Powerful Steps