英文：Peripherals are real devices, such as graphics cards or disks controlled by controller chips on the system board or on cards plugged into it.
中文：外设是一些物理设备，比如说图象卡或者磁盘，它们受控于位于主板或者主板上插槽中的控制芯片。
英文：A LAN is a system of computers and associated peripherals such as Printers that are physically connected by cable within a limited geographical area-typically in an office building or on a college campus.
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