be wise after the event
US /biː waɪz ˈæftər ðə ɪˈvent/
UK /biː waɪz ˈæftər ðə ɪˈvent/
1.
事后诸葛亮, 马后炮
to understand what should have been done only after something has happened
:
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It's easy to be wise after the event, but we made the best decision we could at the time.
事后诸葛亮很容易，但我们当时已经做出了最好的决定。
•
He always tends to be wise after the event, pointing out mistakes when it's too late.
他总是喜欢事后诸葛亮，在为时已晚的时候指出错误。