hindsight

n.事后聪明，后见之明；枪的照门

Hindsight is always better than foresight. 后见之明总胜于先见之明。

Twenty-twenty hindsight can have tremendous value if you accept the hard-won wisdom and move on with life and love. 当你吸取了来之不易的教训，在生活和情路上继续前行时，后见之明会体现出巨大的价值。