in retrospect

US /ɪn ˈrɛtrəˌspɛkt/
UK /ɪn ˈrɛtrəˌspɛkt/
"in retrospect" picture
1.

回想起来, 回顾过去

when thinking about the past, especially with the advantage of knowing how things turned out

:
In retrospect, I should have taken that job offer.
回想起来,我当时应该接受那份工作。
The decision seemed right at the time, but in retrospect, it was a mistake.
当时这个决定似乎是对的,但回想起来,那是个错误。