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。
This sentence is very true. you can achieve little in this world if you just rely on luck. Effort is the real key to achievement.
这句话千真万确。如果你只靠运气，在这个世界上你几乎得不到什么。努力是迈向成功的关键所在。
Review the sentence and key words in this story.
复习故事中的重要句型和重要单词。
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