Rope类被设计成不可修改，这意味着mutator函数永远不会修改原来的Rope实例，而是返回一个修改后的副本。

The Rope class is designed to be immutable, meaning that mutator functions never modify the original Rope instance, but, rather, return a modified copy.

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在任何情况下，我们应避免执行不恰当的修改，比如将函数名或类名作为前缀以生成独特的名称。

In each case, we avoid doing ugly hacks, such as prefixing the name of the function or class to make the name unique.

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这些类定义了修改由它们所表示的对象的所有方法的方法，包括方法或者构造函数中的实际字节码内容。

These classes define methods for modifying all aspects of the item represented by the class, including the actual bytecode body of a method or constructor.

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