这个方法让我们不需要手动复制语法树中没有变更的部分。
This method removes the need to manually copy the unchanged portions of the syntax tree.
想要做出改变，我们需要复制语法树，并替换需要变更的部分。
Changes are made by making copies of the syntax tree, replacing portions as one goes along.
想要做出改变，我们需要复制语法树，并替换需要变更的部分。
Changes are made by making copies of the syntax tree, replacing portions as one goes along.
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