
In retrospect, I think that I was wrong. 回首往事,我覺得當時我錯了.
The decision seems extremely odd, in retrospect. 回想起來,這個決定顯得極其荒謬.
in retrospect: thinking about a past event or situation, often with a different opinion of it from the one you had at the time 回顧;回想;追溯往事