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紫外线是一种辐射能,其波长比可见光的波长(380~780nm)短。国际照明委员会将紫外线按波长分为三个域:
Ultraviolet light is a radiant energy whose wavelength is shorter than the wavelength of visible light (380 to 780 nm). The International Commission on Illumination divides the UV light by wavelength into three domains: