英语语法分析

Perhaps Kipling would say, "Let the jaguar grow melanin."

也许吉卜林会说：“让美洲虎长黑色素。”

Most people don't tan after just one day at the beach, or one session in the tanning bed, because it takes time to make melanin.

大多数人只在沙滩上玩一天或者使用晒黑床一段时间不会被晒成古铜色的皮肤，因为黑色素的合成是需要时间的。

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。