外部设备——例如，通用串行总线(usb)端口或系统时钟。
External devices — For instance, Universal Serial Bus (USB) ports or the system clock.
计算机硬件系统的设计方法，必要时可增加中央处理机的硬件或外部设备来扩充机器的性能。
The design of computers to permit expansion of their capabilities by increasing the central processor 's hardware and the number of peripheral devices as required.
计算机硬件系统的设计方法，必要时可增加中央处理机的硬件或外部设备来扩充机器的性能。
The design of computers to permit expansion of their capabilities by increasing the central processor 's hardware and the number of peripheral devices as required.
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