We should say that every coin has its two sides. So it is with surfing on line.

Generally speaking, students will benefit a lot from Internet. People can get lots of useful information through the Internet quickly ,no matter it is national or throughout the world. We can also listen to the music and chat with the friends far away.The most important of all is that we can search many foreigners who speak English as their native languge, which can help us improve our Enlish rapidly.We can send Email to our good friends in a few seconds---with the internet your friend don't need to wait for so long time as receiving a letter as before.

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But it also can spread many side effects.for example ,there are some sexy news and pictures on web which will not do good to teenagers. And there are some games that can easily attract the students and even make you addict to the games so you can waste a lot of valuable time.

On the whole it will give you both good and bad things, the thing matters much is how do you make use of it.

　　【参考翻译】

我们都说任何事物都有其两面性，所有上网也不例外。

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总的来说，学生通过互联网还是受益颇多的，我们可以很快从网上取得很多有益的信息，不管是国家的还是世界的。还可以在网上听音乐和远方的朋友聊天，最重要的是可以接触到很多讲英语的外国朋友和他们当地的方言，以帮助我们快速提高英语水平。通过互联网我们远方的朋友不再像以前一样需要花很长一段时间才能收到信件，只需几分钟就可以给我们的好朋友发送邮件。

但同时也带来很多不同的影响，比如，很多不利于青少年的色情新闻或者图片在网上出现，同时还有很多易于吸引学生的游戏甚至长时间沉溺于游戏。

总的来看很多东西都有利有弊，就看你如何去利用它。