We describe the concepts of mathematics structure and isomorphism of structures, so that one can get a deeper understanding of the relations between substances in middle school mathematics;
阐明数学结构和结构同构的概念，以加深对中学数学内容相互关系的理解；
APN mathematics structure is defined formally and Qualitative Mapping model can be described vividly by making use of the tool of the APN graphics.
形式化地定义了APN的数学结构，利用APN图形化的工具，形象地描述了定性映射。
APN mathematics structure is defined formally and Qualitative Mapping model can be described vividly by making use of the tool of the APN graphics.
形式化地定义了APN的数学结构，利用APN图形化的工具，形象地描述了定性映射。
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