back in the day idiom
曾几何时（尤用于追忆美好往事时）
used for talking about a time in the past, usually when you are remembering nice things about that time
Back in the day, we had an apartment with a swimming pool. 曾几何时我们还有过一套带游泳池的公寓。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。