In addition, medical scientist have pointed out the health risk that night shift worker face when their circadian rhythms are disrupted.

另外，医学家已经指出夜间工作者由于生物钟被扰乱而带来的健康威胁。

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The risk of an accident grows with each successive night shift, so that a worker is twice as likely to have an accident on the fourth night shift in a row as on the first.

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The young, male shift worker who drives at night Austin Lewis, 25, works back shifts for a Southern California newspaper.

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