Hindsight is the ability to understand and realize something about an event after it has happened, although you did not understand or realize it at the time.
例句
With hindsight, we'd all do things differently...有了事后的認識，我們都會以不同的方式行事。Even with the benefit of hindsight, I doubt I would change anything if I had my time again.就算是事后已經一切明了，如果讓我重來一次，我也不確定自己是否會作出改變。
英漢詞典釋義
n.
事后的覺悟;事后的聰明
It’s easy to say now what we should have done then—with the wisdom of hind sight!現在說我們當時應該如何做是不難的——這全是事后聰明。
英英詞典釋義
Noun
1. understanding the nature of an event after it has happened;