参考例文：
A man is using water as much as he likes washing his clothes regardless of the notice pinned above "Save the water Please."（人们随心所欲的用水洗衣服，毫不在意“请节约用水”的标牌。）
As we see，water is the source of life. But there is very limited available water resources in our world，so we shouldn't waste it. Of course，we have to use it to drink，cook，wash，clean and etc. But we must remember not to use it extravagantly. If we didn't stop such wasteful habits，we would cut off the development of the world and the human life. And what will our next generation use？