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水是一种宝贵的自然资源,无论在工业生产、农业灌溉、交通运输方面,还是日常生活方面,水都是不可缺少的。水在地球上不断地循环运动,为地球表面调节气候,而在雨雪降落时,又清洗大气,净化环境。地球上任何一个生态系统都离不开水,没有水,便没有生命。人类为了维持生存,需要从环境中获得必需的物质空气、水、食物等,水对人类关系是非常密切的。但随着科学技术的飞跃发展和人类生活水平不断提高,各种用水量也在不断增加。同时,工业“三废”和生活废弃物以及不适当地大量使用农药、化肥都可能造成水体污染,影响人类健康。
Water is a valuable natural resource and water is indispensable in industrial production, agricultural irrigation, transport and daily life. Water constantly circulates on the earth to regulate the climate on the surface of the earth. When rain and snow fall, the water is cleaned and the environment is purified. Any one of the planets’ ecosystems can not do without water. Without water, they have no life. In order to survive, human beings need to get the necessary material air, water and food from the environment, and the water has a very close relationship with human beings. However, with the rapid development of science and technology and the continuous improvement of human living standards, various types of water use are also increasing. At the same time, industrial “three wastes” and domestic waste as well as inappropriate use of pesticides and fertilizers may cause water pollution and affect human health.