binary row二进制行孔,二进行,二进制行binaryadj.二进位的；二元的n.二进制；二元binary fixed point data二进制定点数据binary chemical weapons二元(系)化学武器binary system data flow二进制资料流binary digital computer二进制数字计算机,二进数字计算机binary-state variable二态变量,二进制状态变量,二值变数,双态变量,二值变量,双态变数binary-decimal system二-十进制binary digital variable双数字变量binary instruction code二进指令代码binary-decade counter二-十进制计数器binary inductive method二元归纳法

1. Write a function to find the depth of a binary tree.
   写个程序找到一个二叉树的深度。
2. If a binary tree becomes degenerate, we run into the same efficiency problems as we did with the singly linked list.
   如果二叉树变得很不平衡，我们将会碰到同样的效率问题如同在持久化单向链表是一样。