Definition
Referring to a specific moment when an action was considered or executed.
当时
I thought it was a good idea at the time, but now I know I was wrong.
当时我认为这是个好主意，但现在我知道我错了。
He was very excited at the time and didn't realize the consequences.
当时他非常兴奋，没有意识到后果。
We were in a rush at the time, so we didn't check the details.
我们当时很匆忙，所以没有检查细节。