The results were the same even after the researchers controlled for factors like age and racial differences.

研究者按照年龄和种族分类后仍然得到相同的结果。

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The study is also one of just a few to include a high enough proportion of Black couples that researchers can assess racial differences in conflict strategies and their effects.

该研究也是为数不多的包括了足够多的黑人夫妇的研究，使得研究者们可以评估冲突策略的种族差异及其影响。

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What the eye sees as racial differences - between Europeans and Africans, for example - are mainly a way to adapt to climate as humans move from one continent to another.

我们眼中看到的人种差异，例如欧洲人与非洲人的差异，主要是人类从一个大陆向另一个大陆迁移时为适应气候所产生的。

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Many complicating factors, say Clark and others, further taint survey results, including geographical, cultural and racial differences among patients.

FORBES: Why Rating Your Doctor Is Bad For Your Health

But, new research conducted by political scientists from the University of Chicago, suggest the effort could be compromised by huge racial differences on how to rebuild.

NPR: Study on Race and Rebuilding New Orleans

Unlike the USA, which has been a well-established federation on roughly the same geographic map over a century, EU is still a collection of states in an area where ethnic diversities, racial differences, ideology and economic antagonism have changed the map several times.

FORBES: EU: A Collection of Capricious Brides