The highly balanced binary search tree is established in order to improve efficiency of the binary search tree and to shorten the average search tree.
建立高度平衡的二叉搜索树是为了提高二叉搜索树的效率，减少树的平均搜索长度。
Add and Remove operations are typically expensive since Binary Search Trees require that a tree be balanced.
添加和删除操作的开销是很大的，只主要是因为对半查找树的平衡性所决定的。
Add and Remove operations are typically expensive since Binary Search Trees require that a tree be balanced.
添加和删除操作的开销是很大的，只主要是因为对半查找树的平衡性所决定的。
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