請用英語簡單地介紹一下網絡好的一面和不好的一面．要點如下：
1．可以幫助我們更好地了解外面的世界，開闊我們的視野；
2．課后可以和老師在線交流，及時解決課堂上不明白的問題；
3．網絡上有很多不良信息，比如暴力、色情等，給學生造成不好的影響；
4．很多學生沉迷于網絡，影響了學習；
5．長時間上網影響視力和健康．
注意：
1．短文必須包括所有的內容要點，但不得逐句翻譯；
2．詞數(shù)：120左右．
參考詞匯：開闊視野broaden one's horizons 暴力violence 色情porn 沉迷 get addicted to．

The Internet can help us know the world better．We can broaden our horizons through the Internet．Chatting on line with the teachers after class can help us solve the problems that we have not really understood in class．However，on the other hand，there is too much information that might do harm to us on the Internet，like violence，porn and so on．Many students get addicted to the Internet．They spend too much time on it so that they are unable to concentrate on their studies．What's more，spending too much time on the Internet can make us short-sighted and do harm to our health too．
We need the Internet，but we should make good use of it and get rid of the information that we don't need

The Internet can help us know the world better．We can broaden our horizons through the Internet．Chatting on line with the teachers after class can help us solve the problems that we have not really understood in class．However，on the other hand，there is too much information that might do harm to us on the Internet，like violence，porn and so on．Many students get addicted to the Internet．They spend too much time on it so that they are unable to concentrate on their studies．What's more，spending too much time on the Internet can make us short-sighted and do harm to our health too．
We need the Internet，but we should make good use of it and get rid of the information that we don't need

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