由于我国的大部分地区处于温带,夏季受阳光辐射增多,日长夜短,紫外线强度加大,从而增加了阳光对皮肤的照射。人们知道,紫外线直接照射皮肤,除有杀菌作用外,还可以促进维生素D3生成,有辅助补钙作用。但过量的紫外线可对人体的皮肤、眼睛以及免疫系统等造成危害。吸收紫外线过多, Due to the temperate zone in most parts of our country, the sunshine radiation to the skin is increased due to the increase of the sunshine radiation in summer and the long night and short night with the increase of ultraviolet intensity. People know that ultraviolet radiation directly on the skin, in addition to the bactericidal effect, but also can promote the formation of vitamin D3, aided calcium supplement. However, excessive UV rays can cause harm to human skin, eyes and immune system. Absorption of ultraviolet light too much,