Doctor: Right. How long have you been feeling ill? Is it every day?

　　Helen: It's been on-and-off for a few months. I've tried taking aspirin to lessen the pain, but it doesn't help.

　　Professor: So Winnie, how long has Helen had these symptoms?

　　她说已经疼了几个月了，不过，她说这些症状是on-an-off，这是什么意思呢？

　　Professor: That means that sometimes she has them, and sometimes she doesn't.

　　哦，on-and-off 就是说有时候疼，有时候不疼，时好时坏。

　　Professor: Right. You can use this phrase for other things too. For example, "Chris and Tammy keep breaking up, but then getting back together. Their relationship has been on-and-off for the past year."

　　哦，形容恋人的关系是on-and-off，就是说他们总是分分合合。Professor, 医生还问Helen是不是有a history of these symptoms，这就是问她是不是有这个病史，是不是老毛病吧？

　　Professor: Right again! The doctor might also ask if you have a "family history" of a disease, meaning that other people in your family have had the same thing.

　　Family history of a disease? 也就是家族病史。

　　Doctor: I'm not sure what the problem is. I need to do some tests before I can diagnose you.

　　Helen: How long will that take?

　　Doctor: It will take about a week for the test results to come back. Until then, I can give you some pain killers to help alleviate the pain.

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