一个可用的英文语料库，包含20大分类，可用作文本分类语料库-One of the available English corpus, including 20 big classification, usable ZuoWenBen corpus

该文档可在机器学习中用于文本分类的语料库，内涵一个正面语料文档和一个负面语料文档。(This document is a corpus for text categorization in machine learning, with a positive corpus document and a negative corpus document.)