每个逻辑驱动器最上层的文件夹叫做根文件夹。(例如C:\，D:\)。
该方法仅创建库的根文件夹。
其次，Folder 对象通常知道某个 ID 是根文件夹。
Second, Folder objects typically recognize a certain ID to be the root folder.
介绍jaxer根文件夹时，我提到了它里面有几个子文件夹。
When I described the Jaxer root folder, I mentioned that there are several subfolders within it.
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