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Although crimes like theft have been on the rise in recent years it appears as though their incidence is now widespread.

尽管近些年来，像偷窃这样的案件是有所上升，不过，可不像现在这样发生的这么广。

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A later study showed that when Japanese emigrated to the U.S. and adopted a Western diet, their incidence of heart disease soared to ten times that of their countrymen in Japan.

一个稍后的研究表明，当日本人移民美国，并长期采用西方的饮食习惯，他们发生心脏病的可能性十倍于他们远在日本的老乡们。

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We'v e shown that learning optimism prevents depression and anxiety in children and adults, roughly halving their incidence over the next 2 years.

研究证实，乐观可帮助儿童和成人,预防抑郁和焦虑，使未来两年的发病率降低一半。

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There is uncertainty about how common such infections are, since no clearinghouse compiles statistics on their incidence.

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The concept of clusters is now well understood and empirical work on their incidence and impact is growing rapidly.

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When the sun is very active, it can be thought of as pushing away cosmic rays from the Earth, reducing their incidence.

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