WHY is it called as 眼睛,鼻子,耳朵,嘴巴,头发,眉毛,胡子?

1.WHY is it called 眼睛,鼻子,耳朵,嘴巴,头发,眉毛,胡子?
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2.为什厶眼睛上面长眉毛,嘴巴上面长胡子?

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