The receiver of a trapped miner converts the magnetic waves into electrical signals, which he hears as a voice, and he responds with his position.
被困矿工的接收器再把磁波转换成电子信号，他就能听到声音，在他的位置做出回应。
A radio converts the electronic signals of a rescuer's voice into magnetic waves.
无线电设备将一个营救人员电子声音信号转换成电磁波。
And since courts at the time were very noisy, he also practiced by the ocean, projecting his voice above the roar of the waves.
因为法庭很嘈杂，他还在大海边练习，让自己的声音盖过海浪的咆哮声。
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