此病可多次反复发作，持续多年。

Onset: the disease may recurrently attack for many years.

youdao

我认为它是多次反复的，因此我会它的正直跳跃。

I think it's repetitious, so I would just skip by it.

youdao

在能够得到一个干净的编译产品之前，这个步骤可能需要多次反复。

This step may require several iterations before a clean build is produced.

youdao

I think the idea of a stock must have been invented independently at many times in history.

我认为股票这个概念,在历史上被反复提出过多次

耶鲁公开课 - 金融市场课程节选

When the conditioned stimulus and the unconditioned stimulus are brought together over and over and over again, pretty soon the conditioned stimulus gives rise to the response.

当条件刺激与非条件刺激,同时且多次反复出现，条件刺激很快也能引起条件反应。

耶鲁公开课 - 心理学导论课程节选