地理祖先
Geographical ancestor
以上为机器翻译结果，长、整句建议使用 人工翻译 。
因此研究人员能够分析出哪些现代犬只的地理群落在基因上最接近其祖先群体。
That allowed the researchers to determine which geographic groups of modern dogs were closest to ancestral populations genetically.
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地理学家们认为，美洲印第安人的祖先是亚洲人。
The ancestors of American Indians, geographers say, were Asians.
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