Firstly, the undirected graph model in product structure domain, the directed graph model in product function domain, and the vector table model in customer requirement domain were constructed.是什么意思_Firstly, the undirected graph model in product structure domain, the directed graph model in product function domain, and the vector table model in customer requirement domain were constructed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句