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在灿烂的阳光中,有一种人眼看不见的光线--紫外线,人们虽然看不到它的存在,却常常受到它的伤害。大多数人都有过这样的经历:在夏日的阳光下爆晒后,
In the bright sun, there is a kind of invisible light - ultraviolet light, although people can not see its existence, it is often hurt by it. Most people have had this experience: after the summer sun exposure,