第二个原因在于框架本身的改变也具有演化性。

The second reason is because the changes in the framework itself are more evolutionary.

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因此，演化的这些步骤基本上都是在增加演化的可演化性。

So all these steps in evolution are increasing, basically , the evolution of evolvability.

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利用演化规则的函数形式，给出了一些演化规则的演化性质。

By means of the function forms of the rules, evolution properties of some of the rules are described.

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