B2 过去，从前
in the past
In those days people used to write a lot more letters. 过去人们写信要多得多。
In those days I couldn't wait for my birthday.
Back in those days, people cooked from scratch a lot more.
Of course, in those days people didn't keep buying new clothes.
We didn't understand the impact we were having on the planet in those days.
See also: day