main switch的用法和樣例：
例句
- The rheostat is operated by rotating the control knob, separating it from the push-pull action of the main lighting switch.
可變電阻器由旋轉的控制手柄操縱，與燈光總開(kāi)關(guān)的推一拉的操縱是分開(kāi)的。 - I got to turn the main power switch back on.
我得去把主開(kāi)關(guān)打開(kāi)。 - All rooms are linked to the main switchboard.
所有的房間都與主開(kāi)關(guān)連接。
