Ultraviolet rays (aging test box) are invisible light located in the high-energy region of sunlight, and are divided into short wave, medium wave and long wave according to their own wavelengths. Shortwave is harmful to humans, but when it passes through the atmosphere, it is fully absorbed by the ozone layer; medium-wave ultraviolet light is easily absorbed by the skin, also known as the "sunburn (red) section" of ultraviolet light; It penetrates the skin to reach the dermis layer and has an effect on the melanin on the skin surface, which is called "tanning section". Li Xiangshan, played by Sun Honglei in the movie "If You Are the One", committed suicide because of a melanoma. When ultraviolet rays (aging test box) act strongly on the skin, photodermatitis may occur, and erythema, itching, blisters, edema, etc. may appear on the skin; severe cases may also cause skin cancer. In addition, when ultraviolet rays act on the central nervous system, symptoms such as headache, dizziness, and increased body temperature may occur; when they act on the eyes, they may cause conjunctivitis, keratitis, and may induce cataracts. But "intruders" are not harmless. Appropriate ultraviolet (aging test chamber) radiation can produce vitamin D, which can prevent bone diseases such as rickets, osteomalacia, and osteoporosis. People living in low-altitude areas (not yet accustomed to a diet high in vitamin D) and dark-skinned races, especially rely on ultraviolet radiation to produce sufficient vitamin D. The common people have to ask, when will they get sunburned, and when will they only get tanned? Shen Yuanfang said that in the ultraviolet rays received by the human body, the two wave bands of medium wave and long wave exist at the same time. Also sunburn the skin. Shen Yuanfang said that in many cases, sunburns cannot be immediately felt, so activities in the sun can not be "lucky." Non Stick Saucepan,Scanpan Cookware Set,Non Stick Saucepan Set,Best Non Stick Saucepans SUZHOU JIAYI KITCHENWARE TECHNOLOGY CO.,LTD , https://www.jiayikitchenware.com