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介绍一种基于第四代语言的专家系统工具４ＧＥＳＴ的研究，包括其知识的表示方法，推理机和解释器等的实现过程。该工具采用了ＤＢ＋ＥＳ的技术，运用于与／或条件的知识领域。
This paper introduces a 4GEST-based expert system tool based on the 4th generation language, including the representation of its knowledge, inference engine and interpreter implementation process. The tool uses DB + ES technology to apply knowledge of and / or conditions.