事后
after the event; in hindsight; in retrospect
时候
time; length of time; moment; period
事后聪明
wise after the event (idiom); with hindsight, one should have predicted it
事后诸葛亮
a genius in retrospect (idiom); hindsight is 20-20
小时候儿
erhua variant of 小時候|小时候[xiao3 shi2 hou5]