从冬季到春季,除了气温的升高,衣着的减少,花草的绽放之外,还有一个明显的变化,那就是紫外线。一年四季中,冬季阳光的紫外线含量最低,到春天来临时紫外线含量骤然升高,而且由于春季气候干燥,紫外线穿透性强,到达地面的量也多,人们一下子难以适应,极易晒黑。 From winter to spring, in addition to the temperature rise, the reduction of clothing, blooms outside, there is a clear change, that is, ultraviolet light. In the four seasons of the year, the sunlight in winter has the lowest content of ultraviolet rays, the content of ultraviolet rays suddenly rises when the spring comes, and due to the dry climate in spring, strong ultraviolet ray penetration and large amount of reaching the ground, it is difficult for people to adapt to the sun black.