Although this particular Symantec product doesn't offer web content filtering, it does provide certain fine-grained application and device controls.

尽管赛门铁克的这项产品并未提供网页内容过滤的功能，但它确实提供相当详细的程序和设备控管选项。

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Filtering on the input side is less effective because dynamic content can be entered into a Web site database via methods other than HTTP.

对输入端进行过滤的效率比较低，因为通过除了 HTTP 以外的其它方法也可以将动态内容输入到网站数据库中。

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Most search engines work by crawling the Web, indexing and filtering the content they find into massive databases, and searching these databases to find results matching a particular search query.

大多数搜索引擎的工作方式是：在Web上爬行，索引并过滤在海量数据库中找到的内容，然后搜索这些数据库以找到匹配特定搜索查询的结果。

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One tool Magid advises parents to use with caution, however, is Web filtering software like Net Nanny or Cybersitter, which block objectionable content online.

FORBES: On The Web's Edge

Finally, there is the option of installing a filtering program that limits the type of content a user can access on the Web.

CNN: Tools: Protecting your kids online