实现文本理解,进而进行基于理解的信息抽取,是当今信息社会所迫切需要的。要实现完整的文本理解,首要的工作应是对文本在结构上作详细的分析,因各段在文本中的位置,及一些特定的语句的顺序和关系,是理解文本的重要的角色。文本理解是自然语言理解中最重要和最难处理的工作,但是自然语言理解 To achieve text understanding, and then proceed to understand the information extraction, is urgently needed in today’s information society. In order to achieve a complete understanding of the text, the primary task should be to analyze the structure of the text in detail. Because of the position of each paragraph in the text and the order and relationship of some specific sentences, it is an important role to understand the text. Text understanding is the most important and difficult task in natural language understanding, but natural language understanding