/ˈhaɪndˌsaɪt/
后见之明;事后聪明；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.
With hindsight it is easy to say they should not have released him.
事后才说他们本不应该释放他，这倒容易。
What looks obvious in hindsight was not at all obvious at the time.
事后一目了然的事在当时根本看不清。
It’s easy to criticize with the benefit of hindsight.
事后明白了再评价，这自然容易。