Similarly, cultural variations from country to country would make studies on different ethnic groups difficult to generalize across the board.
类似地，不同国家的文化差异也使针对种族的研究变得很困难。
Researchers have also advocated assessing health risks within ethnic groups based on inherited variations in just one DNA base pair.
研究人员也主张，仅仅根据一个DNA碱基对的遗传变异，就可以评估不同种族的健康风险。
Such variations as time, living area and changes in proportion of different ethnic groups in a society all contributed to the complicated pronunciation of place names in Manchu.
时间的推移，活动地域的变迁，社会成员民族成分比例的改变等一系列变化，反映到语言上，就造成了满语地名语音上的复杂性。
Such variations as time, living area and changes in proportion of different ethnic groups in a society all contributed to the complicated pronunciation of place names in Manchu.
时间的推移，活动地域的变迁，社会成员民族成分比例的改变等一系列变化，反映到语言上，就造成了满语地名语音上的复杂性。
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