采用相场编制的Ag-Cr晶粒长大的程序，非常有用-Prepared by the phase field Ag-Cr grain growth process, is very useful

建立了一个二叉树，写出二叉树的结点，然后用前序历遍、中序历遍、后序历遍来访问了整棵二叉树。-A binary tree, write a binary tree node, and then use the pre-order the calendar over the calendar times in sequence, after the sequence to access the calendar over the whole grain binary tree.