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(also off and on)
If something happens on and off during a period of time, it happens sometimes.
時斷時續(xù)地;間歇地
I've had toothache on and off for a couple of months.
我的牙斷斷續(xù)續(xù)疼了幾個月。
He studied for his degree on and off for 75 years.
他斷斷續(xù)續(xù)學習了75年的時間。
It rained on and off all day.
雨斷斷續(xù)續(xù)地下了一整天。