At several levels it checks to see that it has the right child by verifying the name of the element or the name of the sheet.
在每一级，通过验证元素名或工作表名称，检查它是否具有正确的子元素。
A binary tree is a collection of nodes in which each node contains two links, one to its left child and another to its right child.
一个二叉树是一系列节点的集合，每一个节点都包含有两个子节点，一个称之为左节点，而另一个称之为右节点。
A binary tree is a collection of nodes in which each node contains two links, one to its left child and another to its right child.
一个二叉树是一系列节点的集合，每一个节点都包含有两个子节点，一个称之为左节点，而另一个称之为右节点。
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