水是生命之源,人和动植物每时每刻都离不开水。人类的饮用水资源丰富,天上的雨水,地下的井水、泉水及江河、湖泊、高山雪水等,不一而足。自来水是城市发展和人民生活提高的产物。然而,工业化和经济的突飞猛进,又带来了严重的水质污染,于是又应运而生了经技术处理后的净化水、纯 Water is the source of life, people and animals are inseparable from water all the time. Humans have abundant drinking water resources, rainwater in the sky, underground well water, spring water, rivers, lakes and alpine snow water. Tap water is the product of urban development and improvement of people’s life. However, the rapid industrialization and economy have brought about serious water pollution. Therefore, purified water treated by technology has come into being, and pure