这是使范畴系统的逻辑顺序达到整体最优的关键。

This is the key point to achieve the best on the whole for the logical sequence of the categorical system.

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从某种意义上说，这些方法都是构造范畴系统的方法。

In a sense, they are also the ways to construct the categorical system.

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我们在第七章中讨论了构造范畴系统的途径：抽象上升到具体。

We have discussed the approach to constructing the categorical system: advancing from the abstract to the concrete.

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