5. Subtree node is usually referred to as the "left sub-tree" and "the right sub-tree".
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left sub tree
左子树
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The key of a node is always greater than the keys of the nodes in its left sub-tree
节点的键始终大于它左边的子树中的节点的键
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Subtree node is usually referred to as the "left sub-tree" and "the right sub-tree".
通常节点的子树被称作“左子树”和“右子树”。
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