the main printed circuit board that contains the CPU (= central processing unit) of a computer and makes it possible for the other parts of a computer to communicate with each other

The keyboards in most laptops are connected to the mainboard by a thin flat ribbon cable. 大多数笔记本电脑的键盘都是通过一根扁平电缆连接到主板的。

An internal modem is fixed into an expansion slot located on the computer main board. 内置调制解调器安装在计算机主板上的扩展槽中。