When an object is being defined, existing feature classes can be used as object types to make more complex objects.
在定义对象时，可以用已经存在的要素类定义对象，以构造更为复杂的对象类型。
The attribute of VEM part object is specified with parametric method based on feature. The feature classes and part classes are defined.
利用基于特征的零件参数化方法确定了立磨机零件对象的属性，并对各特征类和零件类进行定义。
The attribute of VEM part object is specified with parametric method based on feature. The feature classes and part classes are defined.
利用基于特征的零件参数化方法确定了立磨机零件对象的属性，并对各特征类和零件类进行定义。
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