Onset: the disease may recurrently attack for many years.

此病可多次反复发作，持续多年。

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It will become persistent, more and more severe as the disease recurrently attacks.

随着疾病的反复发作，听力下降将变为持续性的，而且越来越严重。

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In this paper, we give the definition of the recurrently weak-mixing operators in the discrete case, and obtain a sufficient condition under which the product of two operators is weak-mixing.

本文给出在离散情形下回复弱混合算子的定义，并给出两个算子的积是弱混合的一个充分条件。

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This is, of course, disputable. There is a kind of a vogue recurrently in the history of fiction for a kind of miraculous sense that this is just exactly the way things are.

这个，当然，是有讨论余地的，这是一个趋势,循环地在小说历史中出现，为了一种不可思议的理由,说事情就是这样的。

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