动词短语
中文翻译：打开主电源
同义词：
['turn on', 'switch on', 'power on']
例句：
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1. Please turn on the lightsbefore you leave.
在你离开之前请打开灯。
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2. The computer needs to be turned onbefore we can use it.
在我们可以使用电脑之前，电脑需要被打开。
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3. Afterturning on the main, I found thatthe light was not working properly.
打开主电源后，我发现灯光工作不正常。