mains switch的用法和樣例：
例句
- Turn on the main source switch, and the Control Unit is now put in work.
打開(kāi)主電源開(kāi)關(guān)時(shí)控制部件將開(kāi)始工作。 - The mains switch is located on the rear cover along with the AC inlet, all the other knobs and jacks are on the front.
電源開(kāi)關(guān)位于后蓋一起交流入口，所有其他的旋鈕和插孔都在前線(xiàn)。
