not everyone understands the importance of water. Some thinks that water is everywhere so that there is no need to treasure it, therefore they always waste or even pollute water resources. As a matter of fact, water is very essential. Nowadays, water is being overused and polluted, and the situation is getting worse and worse. What has to be done to just call up people's attention to this issue?---that the fact is not we need to, is we must be grateful of the water we live on.