说明：  学习和理解CLIPS编程语言，通过分析用CLIPS编写的“二手汽车智能鉴定评估系统”的程序，深入理解专家系统的编程技巧，加深对专家系统的认识和理解。
(Learning and understanding of the CLIPS programming language, through the analysis of "second-hand car smart identification evaluation system" written with CLIPS program, in-depth understanding of the expert system programming skills, deepen awareness and understanding of expert systems.)