User similarity computing plays a very important role in collaborative filtering systems, user recommendation systems as well as social network services.

用户相似度计算在协同过滤系统、用户推荐系统以及社交网络中有着非常重要的作用。

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There are less expensive and more efficient water filtering systems.

有更便宜和更有效的水过滤系统。

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The paper also describes some important concepts and technology in information filtering systems.

描述了信息过滤系统的重要概念和用于实现的技术；

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Unlike some filtering systems, it works on a page by page basis rather than an entire domain.

FORBES: Connect

The speed with which websites can spring up and move can also catch out some filtering systems, said Mr Haggart.

BBC: The problems of finding filth

But, said Mr Haggart, many filtering systems are too crude and let through sites they should block and stop those that are innocent.

BBC: The problems of finding filth