在情报检索理论中,相关性及适用性是两个重要的概念。有关相关性及适用性的理论是情报检索中许多实用技术的理论依据。但目前在这一方面所进行的研究还远远不能满足实际工作的需要。本文就相 In information retrieval theory, relevance and applicability are two important concepts. The theory of relevance and applicability is the rationale for many practical techniques in intelligence retrieval. However, the research carried out in this area is far from meeting the needs of practical work. This article on the phase