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万物生长靠太阳,人 类生存也离不开阳光,这 是因为阳光中有与人体健 康关系密切的紫外线。适 量紫外线的照射是人体健 康所必须的。婴儿缺乏紫 外线照射可患佝偻病,成 人长期没有紫外线的照射 会降低抵抗力,并引起骨 质疏松软化,导致畸型和 自发性骨折。但是,井下 矿工长期在无
The growth of all things rely on the sun, human beings are inseparable from the sun, it is because the sun is closely related to human health and ultraviolet light. Appropriate amount of ultraviolet radiation is necessary for human health. Lack of ultraviolet radiation in infancy can cause rickets, adult long-term exposure to ultraviolet light will reduce the resistance and cause osteoporosis softening, resulting in abnormal and spontaneous fractures. However, the underground miners long without