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 back in the day 

used for talking about a time in the past, usually when you are remembering nice things about that time

曾幾何時(shí)(尤用于追憶美好往事時(shí))

Back in the day, we had an apartment with a swimming pool.

曾幾何時(shí)我們還有過(guò)一套帶游泳池的公寓。

Back in the day, I used to spend my summers exploring or playing with friends. Now I'm in the office every day.

曾幾何時(shí)我常常在夏天和朋友們一起探險(xiǎn)或玩?！，F(xiàn)在我每天都在辦公室。