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中文摘要：
通过对信息检索的3个经典模型——布尔模型、向量模型、概率模型及其主要的扩展模型进行评述．总结了各种模型的特点、应用途径以及理论上的不足，并探讨解决相关问题的可能途径。
英文摘要：
As the primary content about the field of text digging,the technology of information retrieval has more essentiality for the extractive of information from Web.Then discuss on the three classical information retrieval models and their patulous.Through summing up the virtue and deficiency of them, hope to offer some useful approaches to resolve these problems.
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