名词
中文翻译：电磁交流继电器
同义词：
['electromagnetic relay', 'electromagnetic switch']
例句：
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1. The ac relay is used to control the flow of electricity in electrical systems.
交流继电器用于控制电气系统中的电流流动。
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2. The relay was designed to detect and respond to changes in power demand.
继电器被设计来检测和响应电力需求的变化。
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3.The relay was responsible for switching the power from one circuit to another.
继电器负责将电能从一个电路切换到另一个电路。