这可能解释为什么人类的基因组没有尼安得特人的痕迹，即便这两个物种在一起生活了几千年。
This would explain why the human genome has no trace of Neanderthal DNA despite the two similar species living close together for millennia.
考古学家已经在希腊群岛中的凯利·法尼亚岛和扎金索斯岛上发掘到100,000年前尼安得特人的工具。
Archaeologists have found Neanderthal tools dating from around 100,000 years ago on the Greek islands of Kefalonia and Zakynthos.
非非洲人1%至4%的基因与在尼安得特人身上发现的基因相匹配，于是要分清其人种属性就好困难。
Between 1 and 4 percent of the genes of non-Africans match those found in Neanderthals, making it difficult to draw the species line.
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