Being purple, they absorbed green light and let red and blue pass through.

之所以是紫色，是因为它们吸收了绿光，让红光和蓝光通过。

They were exposed to small enough amounts of light that melanoma was less likely, and their lighter skin better absorbed the UV light.

他们暴露在少量但是充足的阳光下，不仅能避免黑色素瘤的形成还能更好地吸收紫外线。