on and off
偶爾或斷斷續續地
口語·表達斷斷續續或偶爾發生
英文釋義
intermittently; periodically; not consistently; in a sporadic or irregular manner
例句
It rained on and off all day, so we stayed indoors.
典故來源
源自開關或間歇性動作的比喻，強調事情不是持續發生，而是時斷時續。