You may normally boot from a hard drive, but you may sometimes need to boot from a floppy disk, a USB memory key, a CD or DVD, or a network.
您可能通常从硬盘驱动器引导，但有时可能需要从软盘、usb内存密匙、CD或DVD，或者网络引导。
The whole system is controlled by a special computer system provided with back-up memory, key-board, micro-printer and led display.
专用电脑有后备存贮器、键盘、微型打印机及LED显示器。
The whole system is controlled by a special computer system provided with back-up memory, key-board, micro-printer and led display.
专用电脑有后备存贮器、键盘、微型打印机及LED显示器。
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