Hayley教口语，“时断时续地”用英语怎么说？

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。

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