在自动文本分类系统中，特征选择是有效降低文本向量维数的一种方法。
Feature selection is a valid method to reduce the dimension of text vector in automatic text categorization system.
本文对文本分类和信息过滤技术进行了研究，提出了一种多特征选择方法。
Research on text categorization and information filtering are being done, Multiple Feature Selection Method is presented.
本文从书评的定义、书评的特征、分类、图书的选择，书评的意义和功能，书评的标准和书评这的修养等方面进行了论述。
This article explores the definition, content and features of book reviews, the selection of books for review, the function and criteria of book reviews, as well as the self-cultivation of reviewers.
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