利用粗糙集里面的等价关系体现了关键词之间的关系，从而实现了同义词的检索。
It also makes use of the equivalence relation between keywords. this can reflect the relation between keywords, so it can search the Synonyms.
此外，信息检索的实践表明，由于自然语言中存在着大量的同义词、近义词，用户在检索的时候很难全部列举出表示同一概念的不同词汇表达形式，因而易造成漏检。
Practice of information retrieval suggests that there are great deal of synonyms, it is difficult to enumerate all the presentations of words in the same concept, thus it may omit something in result.
为了在检索过程中全面表达查询意愿，提出一种结合同义词典和词对共现距离的查询扩展方法。
To fully express the intention of querying in the information retrieval, we propose a query expansion method based on thesaurus and words co-occurrence distance.
为了在检索过程中全面表达查询意愿，提出一种结合同义词典和词对共现距离的查询扩展方法。
To fully express the intention of querying in the information retrieval, we propose a query expansion method based on thesaurus and words co-occurrence distance.
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