system unit
noun/ˈsɪstəm juːnɪt/
/ˈsɪstəm juːnɪt/
(computing)- the main part of a computer, separate from the keyboard, mouse and monitor, that contains the unit that controls all the other parts of the system
系统单元，系统部件（包含中央处理器，不含键盘、鼠标和显示器的电脑主体部分）