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.

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。

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This paper deals with the problem of optimization of network coverage for rural area, and gives detailed description of the method, idea and procedure with a summarization.

本文对村庄网络覆盖优化过程中解决问题的方法、思路、流程进行了阐述与汇总。

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In the third part: the summarization of the city water area landscape pattern.

第三部分：城市水域景观格局概述。

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