这里所提到的应用是一款地铁路线查询器，当你将手机指向一个方向时，它就会显示出路线标志。
The particular app in question is a subway route finder that shows route signs when you point your phone one direction or another.
定义为nsd的磁盘的磁盘描述符包含在一个文件里，- F标志就用来指向这个文件。
The -f flag is used to point to a file containing disk descriptors for disks to be defined as NSDs.
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