While in most cases, it is not feasible to retrofit the artifacts, the "lesson learned" relates to the importance of a common notation.

而在大多数情况下，对工件进行式样翻新是不可行的，这些“经验教训”是与通用符号的重要性相关的。

youdao

At least you learned a valuable lesson about not getting in over your head.

至少你得到了一个有价值的教训，就是做事情要量力而为。

youdao

A crucial lesson he learned while tackling those challenges is one that's all too easy to lose sight of: "Growth, we now know all too well, is not a strategy."

他从应对众多挑战中学到的一个至关重要的教训，恰恰是很多人极易忽略的：“我们都对增长耳熟能详，但这并非战略。”

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That, perhaps, is a lesson not yet learned at Southwest Airlines .

FORBES: Southwest Going Nowhere

He learned a valuable lesson about not just plunging into the market and buying four flashy, obvious stocks because you happen to play stupid videogames on a PC and have a vague, adolescent familiarity with the technology sector.

WSJ: Joe Queenan on the Son Who Bought Apple Stock | Moving Targets

Almost everyone is a veteran of Iraq and learned the tough lesson there about not declaring victory too soon.

CNN: Behind the scenes: Dreams of a power wash