in retrospect
US /ɪn ˈrɛtrəˌspɛkt/
UK /ɪn ˈrɛtrəˌspɛkt/

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。