短语词组短语off f and on 断断续续;不时地;断断续续地;间歇地off and on time 开关次数Just Off And On 只断断续续;就是持续持断off and on manner 断断续续Written Off And On 核销及stand off and on 一忽儿接近海岸;一会儿接近海岸一会儿远离海岸航驶off and on times 开关次数 返回 off and on