Therefore, the natural language information processing has been unprecedented attention and concern by many researchers at home and abroad.

因此自然语言信息处理得到了前所未有的重视，受到了国内外许多研究者的关注。

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Question Answering (QA) is the next generation of search engine which is related to natural language processing, information retrieval and etc.

自动问答系统是集自然语言处理技术和信息检索技术于一身的新一代智能搜索引擎。

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Through a series of large-scale evaluations, TDT has become a hot problem for worldwide research in the fields of natural language processing, especially in information retrieval.

通过连续的大规模评测，话题识别与跟踪已成为国际上自然语言处理尤其是信息检索领域的一个研究热点。

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