He learned this lesson the hard way – from his own personal experience.

他惨痛地得到了这一教训–从他自己的亲身经历中得来的。

《柯林斯英汉双解大词典》

I learned this lesson from an experience many years ago.

从多年前的一次经历中，我学到了这个教训。

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Nike learned a huge lesson from Apple: the iPod wasn't a massive hit because it was the most powerful music player on the market but because it offered the easiest, most streamlined user experience.

耐克从苹果那里学了很多：iPod的巨大成功不是来源于音乐播放功能的强大，而是来源于提供了最简单最流畅的用户体验。

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