虽然我们每个人都拥有皮肤,但并不是所有的人都了解皮肤的作用。皮肤仅有3毫米厚,却是人体上最大的组织。它像盔甲一样,将人体约2平方米的表面几乎全部覆盖住,使脆弱的人体与外界复杂的环境隔离开来。有害的化学物质和紫外线等往往通过作用于皮肤转而影响人体健康。皮肤是外界环境和机体之间的一个屏障,那么皮肤是否真的象人们所期望的那样总是保持有效 Although each of us has skin, not everyone understands the role of the skin. The skin is only 3 mm thick, but it is the largest body on the body. Like armor, it covers almost all of the human body’s approximately 2-square-meter surface, isolating the fragile body from the complex surroundings. Harmful chemicals and UV rays often affect human health by acting on the skin. Skin is a barrier between the environment and the body, so the skin is really always as effective as one would expect