binary node的用法和樣例：
例句
- Write a function to find the depth of a binary tree.
寫(xiě)個(gè)程序找到一個(gè)二叉樹(shù)的深度。 - This paper analyzed the relation between the complete binary tree nodes and the leaves number by two ways.
該文從兩個(gè)角度分析了完全二叉樹(shù)的總結點(diǎn)數與葉結點(diǎn)數之間的關(guān)系。
