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Dear Sir, I am Li Wei, a student from Haikou Middle school. I am writing to you to talk about the problem of pollution of the river near our school. Before the running of your factory, the river is very clean. But after your factory poured waste water into the river, it became pollutaed and now it is very dirty and smells terrible. It is not good! So I'd like to ask your help to do something and protect the environment. Thank you very much! Yours Liwei 尊敬的领导： 你好！ 我是海口中学的一名学生，叫李伟。我写信给你是要讨论一下我们学校附近的这条小河的污染问题。 在你们工厂搬来之前，小河的水很清澈。但是你们来了之后，开始往里面倾倒废水，它受到了污染，开始变脏了，并且散发出恶心的味道。这很不好。 我想请你帮忙采取措施来保护环境。 很感谢你！ 李伟