Pinyin/Ultraviolet radiation

See also Ultraviolet (UV) radiation is electromagnetic radiation, with wavelengths between 100 and 400 nm. Small amounts of UV radiation are essential for the production of vitamin D in humans, but exposure to large doses may have short- and long-term adverse effects on the skin, the eyes and the immune system. Zǐwàixiàn fúshè shì bōcháng zài 100 yǔ 400 nm zhījiān de diàncí fúshè. Shǎoliàng zǐwàixiàn fúshè duì réntǐ shēngchéng vitamin D shì bìxū de. Dàn guòdù bàolù yú zǐwàixiàn fúshè zé kěnéng duì pífū, yǎnjīng hé miǎnyì xìtǒng zàochéng duǎnqī hé chángqī de sǔnhài. Category:Pinyin/Health Category:Pinyin/Vitamin D