在大多数基于规则的专家系统中的基本表示单元。
The basic representation unit in most rule-based expert systems.
分析了当前基于规则的专家系统存在的问题，介绍了基于案例推理（CBR）的概念。
The features and problems of the current rule_based expert systems is firstly summarized, and then an introduction to Case_Based Reasoning (CBR)is given.
这个项目叫做Drools，它是一个用来在应用程序内开发基于规则的专家系统的系统。
This project — called Drools — is a system for developing a rules-based expert system within an application.
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