The part element library was constructed by object-oriented method and could be extended without changing the system structure.
采用面向对象的方法构建部件单元库，能在不改变系统结构的条件下对部件单元库进行扩充。
The part element library was constructed by object-oriented method and could be extended without changing the system structure.
采用面向对象的方法构建部件单元库，能在不改变系统结构的条件下对部件单元库进行扩充。
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