On | off - Turn column specifications for a specific column on or off.
ON |OFF-为一个指定的列打开或关闭列规范。
(take off, put on) Please take off your old coat and put on this new one.
请脱下你的旧上衣，穿上这件新的。
My girlfriend and I have been on and off, on and off several times.
我跟我女朋友分分合合好几次了。
My girlfriend and I have been on and off, on and off for several times.
我和我女朋友分分合合几次了。
My girlfriend and I have been on and off, on and off for several times.
我和我女朋友分分合合几次了。
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