给皮肤上色看起来很简单，但大自然却至少需要25种不同的基因来合成、包装及输送黑色素到人体各处以使皮肤和头发呈现不同颜色。
Coloring the skin may sound simple, but nature requires at least 25 different genes to synthesize, package and distribute the melanin pigment that darkens the skin and hair.
给皮肤上色看起来很简单，但大自然却至少需要25种不同的基因来合成、包装及输送黑色素到人体各处以使皮肤和头发呈现不同颜色。
Coloring the skin may sound simple, but nature requires at least 25 different genes to synthesize, package and distribute the melanin pigment that darkens the skin and hair.
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