As we all know, plants and animals need water. So do the people's life and production, life couldn't go on without water.

With the rapid development of agriculture and industry, more and more water is needed. Therefore, water is being scarce in many places. What's more, a lot of rivers and lakes are beginning polluted by the waste watcr from factories. Fish can't live in them any longer.At the same time, thc waste water does great harm to people's health.

In order to make rivers and lakes clean and prevent water from being polluted,we must do something to stop all sorts of pollution.

正如我们所了解的，动植物需要水，人类的生产生活也需要水。没有水便没有生命。

随着工农业的迅速发展，水的需要量越来越大。因此，许多地方缺水。而且，许多河流湖泊被工厂排放的污水所污染，鱼不能生存。同时，废水给人们的健康带来极大的危害。

为了保持河流湖泊清洁，防止水污染，我们必须采取措施，阻止各种污染。