為什麼人類有眉毛?

A: Originally to keep rain and sweat out of our eyes. As a species we humans rely on our sight more than other sense,and water can serious blur vision. eyebrows may also deflect debris and shield our eyes from the Sun.so while we slowly evolved to lose most of our body hair, our eyelashes and eyebrows remained.

   But eyebrows then took on another function: communication. Facial expressions convey meaning and emotions in ways that are hard to fake,and the eyebrows exaggerate expressions. Even in cartoons,a simple line above the eyes is enough to denote anger, fear, or surprise in a face, and experiments have shown that we can recognise  a familiar face more easily when the eyes are blanked out than when the eyebrows are.So if you're tempted to redesign your eyebrows by shaving or plucking them, do remember their many uses.

眉毛最初的功能是為了阻擋雨或是汗水干擾我們的眼睛，我們人類依靠視覺的程度遠大於其他感覺，而水分會使得視線變得非常模糊(所以才需要眉毛來保護眼睛)眉毛同時還可以偏移空氣中的破片以及保護眼睛受陽光直射。因此，即便我們在演化途中逐漸失去身體上大部分的毛髮，我們仍然具有眼睫毛以及眉毛－ㄌ

   不過眉毛還扮演另一項功能－－溝通。臉部表情可以傳遞許多難以做假的涵義及情感，而眉毛幫助我們強化表情的張力。即便在卡通節目中，一個簡單的眼神示意就足以勾勒腳色的氣憤、恐懼或是驚訝。另外根據實驗結果也顯示出當某人的眉毛極為扭曲時，人們會更容易記得他的面貌。所以，當你想要重新設計你的眉毛造型時，不管修剪也好撥弄也好，千萬不要忘記它們原來的用途!