However, existing knowledge representation is not sufficiently open to product designers, which make them not easy to understand and maintain the knowledge in the design software.
但现有知识表示方式缺乏对产品设计人员的开放性，不利于设计人员理解和维护设计系统中的知识。
However, existing knowledge representation is not sufficiently open to product designers, which make them not easy to understand and maintain the knowledge in the design software.
但现有知识表示方式缺乏对产品设计人员的开放性，不利于设计人员理解和维护设计系统中的知识。
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