Definition
Referring to a point or period in the past.
曾經
This restaurant was at one time the best in town.
這家餐廳曾經是城裡最好的。
He was at one time a very accomplished athlete.
他曾經是一位非常出色的運動員。
They were at one time very good friends, but not anymore.
他們曾經是非常好的朋友，但現在不是了。