[计] 主开关
[化] 主控开关

main switch的用法和样例：

例句

The rheostat is operated by rotating the control knob, separating it from the push-pull action of the main lighting switch.可变电阻器由旋转的控制手柄操纵，与灯光总开关的推一拉的操纵是分开的。
I got to turn the main power switch back on.我得去把主开关打开。
All rooms are linked to the main switchboard.所有的房间都与主开关连接。

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