generalization concept
... 一般系统理论 general systems theory 类化 generalization 类化概念 generalization concept ...
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文化分类概念 classification of culture
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你已经看到了另一个类层次的实例，它很好的阐明了子类化的概念。
You've actually seen one instance of another class hierarchy that also serves as a good illustration of the idea of extension by subclassing.
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