This reduces memory usage during the iteration because the stack depth is constant instead of dependent on the height of the tree.
这减少了迭代过程中的内存占用，因为堆栈深度始终保持一致，而不依赖于树的高度。
2
If you have same file tree for different platfroms you could specify only file name for include file in the source code and use platform dependent include directory.
如果你有相同的文件树的不同的平台你可以只指定文件名的文件中包括源代码和使用依赖于平台包括目录。
3
The tree may prefer calm but the wind will not, sub-For dependent and pro-not - you have their parents pay attention to it?