at one time   (TTS發音)

once曾經；在某一時間（常指過去）

    This kind of wine was very popular at one time， but now it is considered too strong. 這種酒曾經很受歡迎，但是現在被認為度數太高了。

    At one time we met frequently. 曾經有一個時期我們經常會面。