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