黑色素使皮肤变黑是人被晒黑的原因。

Melanin darkens the skin and is the cause of suntan.

youdao

屏幕变黑了；他通过加上褐色使颜色变暗了。

The screen darkened; he darkened the colors by adding brown.

youdao

屏幕变黑了；他通过加上褐色使颜色变暗了。

The screen darkened; he darkened the colors by adding brown.

youdao