You need a lot of eumelanin to absorb UV rays.

你需要大量真黑色紫外线。

It gets its color from two types of melanin: brown-black eumelanin and red-yellow pheomelanin.

棕黑色真黑色和红黄色褐色。

Over the course of generations, humans living at the Sun-saturated latitudes in Africa adapted to have a higher melanin production threshold and more eumelanin, giving skin a darker tone.

数代之后生活在阳光充沛赤道地区周围居民进化出了更高黑色产生阈值，同时分泌出更多真黑加深了皮肤色调。

There's eumelanin, which gives rise to a range of brown skin tones, as well as black, brown, and blond hair, and pheomelanin, which causes the reddish browns of freckles and red hair.

一种是真黑，负责形成一系列棕色调皮肤以及黑棕和金色毛发，另一种是褐黑，负责形成红棕色雀斑与红色毛发。