a blast from the past something that suddenly and strongly makes you remember a previous time in your life 勾起回忆的人或事，带有怀旧的意味。
Bumping into my high school sweetheart in the mall today was really a blast from the past. 今天在购物中心撞见高中时的恋人，让我勾起了对往事的回忆。
Hearing that record again was a real blast from the past.
类似表达：bring back memory// remind me of ...