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.

听到那首歌，让我回想起了那些旧日时光。

类似表达：bring back memory// remind me of ...