紫外线——晒伤皮肤的元凶紫外线是一定波长范围内的光线,根据波长大小,又可将其分为:长波紫外线、中波紫外线、短波紫外线。长波紫外线在任何地区全年都存在,它不仅可以穿透玻璃,而且80%可穿透真皮。中波紫外线可被普通玻璃所阻挡,主要由表皮吸收。短波紫外线可被皮肤角质层吸收。长波紫外线、中波紫外线是造成皮肤损伤的主要紫外线。阴天、雨天没太阳时,紫外线很弱,但是长波紫外线可以 UV - the culprit of sunburn skin UV light is a certain wavelength range, according to the wavelength size, but also be divided into: long-wave UV, UVB, shortwave UV. Long-wave ultraviolet light exists throughout the year in any area, it not only penetrates the glass, but also penetrates 80% of the dermis. UVB can be blocked by ordinary glass, mainly absorbed by the epidermis. Short-wave ultraviolet light can be absorbed by the stratum corneum. Long-wave UV, UVB rays are the main UV rays that cause skin damage. Cloudy, rainy days when the sun is weak, but the UVA can be