为解决词频矩阵的词频维数过大和矩阵过于稀疏的问题，提出一种子主题区域划分的多文档自动文摘方法。

In order to solve the greatly dimension of word frequency and sparse matrix, this paper proposes a multi-document summarization method based on sub-topics area partition.

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据这项对2000名英国男性开展的调查显示，脱发或头发稀疏是男性担心的第二大形象问题，有40%的受访者对此感到担忧。

Hair loss or thinning, is the second most common concern, worrying 40 percent of the respondents to the Mintel survey of 2, 000 British men.

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针对协同过滤中的数据稀疏问题，提出了一种基于粗集的协同过滤算法。

Aiming at the problem of data sparsity for collaborative filtering, a novel rough set-based collaborative filtering algorithm is proposed.

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