亲历回忆

(noun, SLANG) A vivid memory; to remember something so intensely that it is almost like reliving the original experience.

EXAMPLE: When I tasted the cookie I had not enjoyed since I was a small child, I had a flashback in which I suddenly remembered many happy details of my childhood.

在品尝这块我只在小时候吃过的饼干时，我产生了亲历回忆，一下子想起了我儿童时代很多的快乐细节。

by trial and error

通过试错

To solve a problem by trying many different possible solutions, experimenting with one after another, until the correct answer is found.

EXAMPLE: I found an old locked chest in my grandfather抯 house and a bag of keys, so by trial and error I tried each key until I found the one key which opened the chest.

我在祖父的房间里发现了一个锁住的箱子和一包钥匙，我采取试错的方法，用每把钥匙试开，直到其中一把打开了箱子。