We have analyzed the Chinese character ability structure, divides into the factor level, the foundation course, the application layer and the auxiliarylevel.
汉字能力的结构，分为因素层、基础层、应用层和辅助层。其中，因素层是掌握层，基础层和应用层是运用层。
3
If so, then the current entry must be a folder, and you push its name and recursion level onto an auxiliary stack as well as adding it to the tree.