数据稀疏性是协同过滤系统面临的一个巨大挑战。
Data sparseness is a serious problem in collaborative filtering system.
一旦内容被推荐至首页，协同过滤系统的工作就算完成了。
Once the content is promoted to the front page, the system's job is done.
协同过滤系统的这两个方面会产生两个非常不同的重要效果。
The two aspects of the (CF) system result in two very different and important results.
协同过滤(CF)系统毫无疑问是社会化网络的生命线。
The (CF) system is without a doubt the lifeblood of the social web.
协同过滤(CF)系统毫无疑问是社会化网络的生命线。
The (CF) system is without a doubt the lifeblood of the social web.
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