Water is very important to the human beings.But now many rivers and lakes are polluted.
And what shall we do We can do like these things:
First we must prevent the factory from pouring waste water into the river
Second we should stop people from throwing litter into the river.Many kinds of litter may pollute the environment.
Finally we can tell the visitors how important the water is.
After doing these things,I think water will become cleaner sooner or later.Act now,and save water.
水是对人类非常重要.但是现在许多河流和湖泊受到污染.
而我们该怎么办?我们可以这样做：
首先,我们必须防止工厂将污水倒入河流.
其次,我们应该阻止人们把垃圾扔进河流.各种垃圾会污染环境.
最后,我们可以告诉参观者,水是