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网络有很多好处，不过网上聊天并不是没有危险的。由于看不见对方，要骗人是很容易的。所以，网上交友必须非常谨慎。另外，网上的虚拟世界让人陶醉，以至于有些人会因此沉迷其中而无法自拔。这些人花太多时间上网了，对他们而言，虚拟世界变得比真实世界还要重要。很显然，这不很健康。所以在上网时，还是要有所节制才好。

There are many good things about the Internet. However, chatting is not without its dangers. It is easy to fool people when they cannot see you, so one should use caution when meeting a chat friend. Also, the virtual world of the Internet can be so intoxicating that some people actually become addicted. These people spend so much time on the Internet that their virtual lives become more important to them than their real lives. Clearly, this is not very healthy. Therefore, when using the Internet, be sure to do it in moderation.

(Source: wwenglish.com)