A suntan, she explained, was a defensive skin reaction to produce more of the pigment melanin to protect itself from too much harmful ultraviolet (UV) radiation.
A suntan, she explained, was a defensive skin reaction to produce more of the pigment melanin to protect itself from too much harmful ultraviolet (UV) radiation.
她解释说晒黑是皮肤的一种防御反应，皮肤为了保护自己免受过多的有害的紫外线的照射产生更多的黑色素。