这是我第一次对外延性原则隐隐地表现出欣赏，在此后的几十年间我一直很重视这个原则：共相不过是其殊相的总和。

It was my first implicit appreciation of the principle of extensionality by which I have set such store down the decades: the universal is no more than the sum of its particulars.

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然后，分析了信用卡运作体系的网络外延性等特征以及三项主要原则。

Then it analyzes the network externalities of structure and its three principle rules.

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