noun · the principal aircraft in a military formation, usually piloted by the flight leader

在飞行编队中，两架僚机必须紧紧跟随主机的路线。

noun · the central processing unit of a computer system, a server, or a network host

请将键盘和鼠标连接到电脑主机上。

noun · the primary engine or power unit of a ship, vehicle, or mechanical system

轮船的主机正在全力运转。