非数据描述符最常用于返回一个可调用对象。
The non-data descriptor is likely to be used to return a callable object.
当一个文件描述符上数据准备好时，它无法立即响应。
It cannot respond to a file descriptor immediately when the data becomes ready.
卷组中的每个磁盘都有管理数据，包括卷组描述符区域和卷组状态区域。
Each of the disks in the volume group has management data, including a volume group descriptor area and a volume group status area.
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