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。
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