A tree zipper is typically composed of a path from the root to the current location in the tree, plus the subtree context at the focal node.
树z ippers通常包含从根到树中当前位置的一条路径，另外还有关注节点的子树上下文。
A tree zipper is typically composed of a path from the root to the current location in the tree, plus the subtree context at the focal node.
树z ippers通常包含从根到树中当前位置的一条路径，另外还有关注节点的子树上下文。
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