This paper introduces several key technologies of QA, then analyses methods and characteristics of sentence retrieval in Chinese question answering system.
本文首先简单介绍了问答系统中的几种关键技术，然后对问答系统中信息检索模块句子检索的方法和特点进行了分析。
The key question is the number of levels to create, and several organising principles are possible for this purpose.
关键的问题是要分多少级，一些生物学的原则对这个问题可能有些帮助。
The key question is the number of levels to create, and several organising principles are possible for this purpose.
关键的问题是要分多少级，一些生物学的原则对这个问题可能有些帮助。
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