Ultraviolet (UV) rays emitted by the sun are the leading environmental cause of skin complaints, premature ageing, sun burn and even skin cancer.

太阳放射出的紫外线是引起皮肤过早老化、皮肤晒伤甚至皮肤癌等问题的主要环境因素。

youdao

Sunburn is literally a burn on your skin. It is a burn from ultraviolet radiation.

从字面意思理解，晒伤就是皮肤上的灼伤，是来源于紫外线辐射的灼伤。

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Ultraviolet A, UVA, can travel more deeply into the skin, but both UVA and UVB rays can burn skin.

紫外线A，也就是长波紫外线，穿透皮肤更深，不过紫外线A和B都能晒伤皮肤。

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Ultraviolet,also called U-V,rays cause the skin to burn.

VOA: special.2010.07.06

While some gems may appear colorless in daylight, under ultraviolet light they can burn a bright blue or green.

FORBES: Cindy Chao's Butterfly Brooch Added to Smithsonian Gem Hall