线索二叉树，能帮助我们快速的建立二叉树，不需要重复代码，这样会使得设计者更加的轻松-ThreadTree is a BinaryTree which is converinint to built a BinaryTree , everyone wants to learn it , it really can help us ，we also learn how to build a BinaryTree.lt was a cool fall afternoon in Manhattan. T