骨头上也有敲击的痕迹，是露西的朋友们为了获取骨髓而敲碎骨头时留下来的。

The bones also had percussion marks, sustained while Lucy's friends smashed the bones to get at the marrow.

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为了确定人类啃噬骨骼后会留下什么类型的痕迹，研究人员组织了四个不同的欧洲人小组，让他们啃噬不同动物或生或熟的肉骨头。

To determine what patterns humans leave behind when they chew or gnaw on bones, the researchers had four different groups of European people chew raw and cooked meat bones from various animals.

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这种思路展现了一种激动人心的可能性：语言可能留下了化石纪录——不是埋在地下的骨头，而是在我们的DNA当中。

This line of thinking raised an exciting possibility: Perhaps language left a fossil record after all-not in buried bones, but in our DNA.

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