名词
中文翻译：Unknown
同义词：
['polarity-switch', 'polarity-changer', 'polarity-switcher']
例句：
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1. The pole-changing switch is used to adjust the direction of the current flow.
极性切换开关用于调整电流的流向。
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2. The engineer made a pole-changing switch to prevent the power outage.
工程师制作了一个极性切换开关来防止停电。
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3. The pole-changing switch was designed to be easy to operate and maintain.
极性切换开关被设计为易于操作和维护。