如果具有子代，那么当前条目必须是一个文件夹，您要将其名称和递归级别推到辅助堆栈上并将它们添加到树中。
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.
若要了解如何使用辅助索引，请考虑当用户更改邮件在邮件文件夹中的显示方式时所发生的操作。
To understand how a secondary index is used, consider what occurs when a user changes the way messages are presented in a messaging folder.
通过计算，在屏幕上显示出四爪卡盘各卡爪需要调整的数据，实现机车轮箍加工的计算机辅助装夹控制。
The auxiliary fixing is realized on locomotive wheel rings manufacturing by the ranging data showed on the computers screen.
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