可以使用这个命令让系统从CD、磁盘、网络或其他设备引导。

You can use this command to tell the system to boot from CD, disk, the network, or other devices.

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可以从支持的设备(如软盘驱动器、CD、USB key或主驱动器上的微小分区)执行初始引导步骤，然后使用外置驱动器进行其他操作。

You can perform the preliminary boot steps from a supported device such as a floppy drive, CD, USB key, or a tiny partition on the main drive, and then use the external drive for everything else.

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