黑素子类别中的褐黑素的多少会决定头发红色的程度，而另一类真黑素则会决定头发灰、黑、黄和棕色的程度。
The subtype pheomelanin is responsible for red hair, while the subtype eumelanin is responsible for grey, black, yellow, and brown hair.
她有一头金棕色的长发，她的微笑摄人心魄，最动人的部位是她那双褐绿色的眸子，让我感觉似曾相识。
She has dirty blond hair, a seductive smile, and the most engaging set of hazel green eyes I've ever seen.
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