Melanin is also responsible for hair and eye coloring .

黑色素同时也主导着头发和眼睛的颜色。

Melanin is the brown pigment that causes tanning .

黑色素是一种能够导致晒黑的褐色色素。

Dark-skinned people produce more numerous and deeper-colored melanin particles .

深色皮肤的人产生更多深色的黑色素。

Melanin also plays a role in the development of certain optical nerves .

黑色素同时还在某些视神经的发育过程中发挥作用。

Melanin is the body 's way of protecting skin from burning .

黑色素是一种人体自身保护其皮肤避免灼伤的方式。