什么是紫外线？阳光中的紫外线是肌肤的大敌，按波长可以分为长波紫外线（UVA）、中波紫外线（UVB）和短波紫外线（UVC）。短波紫外线通过地球的大气的臭氧层时已被吸收，很少能够到达地面。对皮肤有危害的主要是中波和长波紫外线。中波紫外线虽然有一部分通过臭氧层时已被过滤 What is UV? The sun’s ultraviolet rays are the enemy of the skin, according to the wavelength can be divided into long-wave ultraviolet (UVA), ultraviolet (UVB) and short-wave ultraviolet (UVC). Shortwave UV rays have been absorbed by the Earth’s atmospheric ozone layer and rarely reach the ground. Harmful to the skin are mainly medium-wave and long-wave UV. Although UVB has been partially filtered through the ozone layer