名词
中文翻译：主电源开关
同义词：
['main power switch', 'main switch', 'primary switch']
例句：
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1. The master power switch is located on the wall behind the desk.
主电源开关位于桌子后面的墙上。
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2. The engineer had to turn off the master power switch before starting the new project.
工程师在启动新项目之前必须关闭主电源开关。
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3.The master power switch controls the entire building's electrical system.
主电源开关控制整个建筑的电气系统。