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汉语拼音：zǐ wài xiàn

波长比可见光短的电磁波，在光谱上位于紫色光的外侧。可使磷光和荧光物质发光，能透过空气，不易穿过玻璃，有杀菌能力，对眼睛有伤害作用。用于治疗皮肤病、矿工的保健以及消毒等。

1. 一种波长比可见光线短的电磁波，波长由4000埃到60埃，在光谱上位于紫色光的外侧。紫外线能使磷光和荧光物质发光，能透过空气，不易穿过玻璃，有杀菌消毒的能力，对眼睛有伤害作用。也称紫外光。

• Strong ultraviolet radiation, easy to make skin flexible Keratosis lost, resulting in premature aging.

  紫外线辐射强烈，容易使皮肤角化失去弹性，造成早衰。

• Ultraviolet light heats the edges of the dark cloud, releasing gas into the relatively empty region of surrounding space.

  紫外线能够加热黑云的边缘，将气体释放到周围的宇宙空间里。

• The ultraviolet light could make it possible to determine how long ago oil had washed up in a given region, Kirby said.

  Kirby说，紫外线能用来确定油污被冲到某一特定区域的时间。

• Light is often used as a water purifier and existing methods rely on processes stimulated by ultraviolet (UV) light.

  水净化技术中经常用到光照，而现有的技术主要依靠紫外线。

• The incoming tide churns the matter together. Ultraviolet light, like the sun, adds a heat source.

  上涨的潮水将所有东西搅在一起，太阳的紫外线将其加热。

• ULTRAVIOLET light has long been used in water-treatment plants to help with disinfection.

  紫外线消毒灯一直被用于水处理厂。

• No friends? Make some online so you don't have to leave your house and expose your skin to the sun's damaging rays.

  没有朋友？可以找几个网友，这样你就不需要离开房间，不需要让皮肤暴露在紫外线中。

• A layer of rock just a few microns thick blocks UV, but adding more shielding actually increases the dose of other types of radiation.

  一层只有数微米厚的岩石，就可以阻挡紫外线，但是添加更多遮蔽，反而会增加其他种类辐射的剂量。

• The sun's ultraviolet-B rays absorbed through the skin are the body's main source of this nutrient.

  人体获得维生素D的主要来源是通过皮肤吸收太阳的中波紫外线。