Correct a concept.

2 years ago · 33fd86cf60
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 ## 平衡二叉树

-**「平衡二叉树 Balanced Binary Tree」，又称「AVL 树」** ，其任意结点的左子树和右子树的高度之差的绝对值 $\leq 1$ 。
+**「平衡二叉树 Balanced Binary Tree」** ，其任意结点的左子树和右子树的高度之差的绝对值 $\leq 1$ 。

 ![balanced_binary_tree](binary_tree_types.assets/balanced_binary_tree.png)