The requirements describe all the product functions, as well as the constraints under which these functions should be realized.
需求描述了所有产品功能，并且定义了实现这些功能的约束条件。
The result shows the product functions wonderfully.
结果表明：产品性能良好。
Design construction of plastic and metal parts according to required product functions.
根据产品的功能需要，进行塑料件、金属件等的结构设计。
The symbol expressing, operating, constituting and editing methods of conceptual parts are discussed, visually editing of product functions during conceptual design is realized.
讨论了概念零件的符号表示、运算、构造和编辑方法，实现了概念设计阶段产品功能的可视化编辑。
The existing product structure can be mapped to its product functions by using functional ontology, and the design principles can be represented by functional decomposition tree.
使用功能本体实现现有产品结构到其功能的映射，利用功能分解树表达产品的设计原理。
The existing product structure can be mapped to its product functions by using functional ontology, and the design principles can be represented by functional decomposition tree.
使用功能本体实现现有产品结构到其功能的映射，利用功能分解树表达产品的设计原理。
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