I'd like to tell you something more about the problem of pollution we are facing to. As we know, the factory besides our school gives off heavy smoke all day long. Very loud voices hurt our ears. Rubbish and waste are thrown here or there. It also sends out polluting water and poisonous gas. All this has made a great harm to the health and study of the teachers and students. But as time goes on, a little has done to change the situation. I don't think we could study well unless the problem is solved. We do hope you'll help and support us.

Java源程序文件编译后产生的文件成为字节码文件，其扩展名为 【6】 。