然而，比民族群体增长更令人担忧的是越来越多的移民返回其原籍国。

A far bigger cause of concern than the growth of national groups, however, is the increasing number of migrants who return to their countries of origin.

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例如，他们必须确保他们制定的措施对每一个被研究的文化或少数民族群体都是有意义的。

For example, they must make sure they construct measures that are meaningful for each of the cultural or ethnic minority groups being studied.

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据估计，有超过2000个印度民族群体。

It's estimated that there are more than 2, 000 ethnic groups in India.

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Conquest and exile were events that normally would spell the end of a particular ethnic national group, particularly in antiquity.

一般情况下，一个种族群体的结局,不外乎就是征服其他民族或被其他民族征服，然后被流放，特别是在古代。

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And obesity is a huge problem in the United States, especially in the African american community and other minority communities.

在美国,肥胖症是一个严重的问题,尤其在非裔美国人和,其它少数民族群体中

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