to be wise after the event
used to mean that it is easy to understand what you could have done to
prevent something bad from happening after it has happened
事后聪明很容易;放马后炮很容易
In retrospect, we should have insisted on checking his calculations, but it's
easy to be wise after the event.
回想起来，我们本该坚持检查他的计算结果，不过事后聪明倒是容易。
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16 October 2022
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