on and off
If something happens on and off during a period of time, it happens
sometimes.
时断时续地;间歇地
I've had toothache on and off for a couple of months.
我的牙断断续续疼了几个月。
Mike and I were pretty serious for about a year, but our relationship has
been off and on ever since we graduated.
麦克和我是认真地谈了有一年了，但是自从我们毕业后，我们的关系就断断续续时好时坏的。
往期精选
20 Sept 2023
☝ Hayley教口语，“非常时期非常手段”用英语怎么说？
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