copying of binary tree

例句：

1. 1. The algorithm for copying binary trees is quite complex.
   用于复制二叉树的算法相当复杂。
2. 2. This software can copy binary trees and perform operations on them.
   这款软件可以复制二叉树并进行操作。
3. 3. The engineers used a specialized tool to copy the binary tree structure.
   工程师们使用了一种专门工具来复制这种二叉树结构。