These disasters bring great painful lessons.

这些灾害给他们带来了沉痛的教训。

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We must remember these painful lessons paid for in blood.

我们要牢记这些惨痛的血的教训。

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Thankfully we seem to be learning from those painful lessons of the past.

谢天谢地，我们似乎从过去这些沉痛的教训中吸取了经验。

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Both oil producers and miners recall painful lessons of previous decades when low prices were the norm.

ECONOMIST: The bugs are back | The

Banks are highly regulated and have learned some painful lessons over the years.

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We have turned prejudicial blind eyes to injustices against some groups and have learned painful lessons in the aftermath.

FORBES: In Reflection, With Resolve, Rediscovering American Exceptionalism