Chapter two presents the basic principle and method of product information modeling based on symbol.
第二章提出了基于符号的产品信息建模基本原理和方法。
Physics is nonfigurative. It is based on concept, and it integrates a symbol system;
物理学是一门抽象的科学，它以抽象的概念为基元，形成了完整的一套符号体系；
Physics is nonfigurative. It is based on concept, and it integrates a symbol system;
物理学是一门抽象的科学，它以抽象的概念为基元，形成了完整的一套符号体系；
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