Dr Mark Shriver, who studies human origins at Penn State University, is interested in ancestry, variations in skin and hair colour, facial features and height.

宾夕法尼亚州立大学研究人类起源的马克·施莱佛博士感兴趣的是血统，皮肤和头发的颜色、面部结构和身高的变化。

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In one study the person's gender was reported perfectly by 100 percent of witnesses, hair colour about 73 percent accurately, but facial hair almost always incorrectly.

在一项研究中100%的目击者准确地认出了嫌疑犯的性别，73%的目击者正确说出了罪犯头发的颜色，但是几乎无人能准确地说出他面部的毛发。

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