In this model, any variable you create references an object that has been created from the overall class hierarchy.
在这一模型中，您创建的所有变量都将引用在总的类层次结构中创建的对象。
In this model, any variable you create references an object that has been created from the overall class hierarchy.
在这一模型中，您创建的所有变量都将引用在总的类层次结构中创建的对象。
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