You may be able to use a device that transmits radio signals.

你可以使用一种能发射无线电信号的装置。

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In some states, you may be able to use a device that sends radio signals, allowing stolen cars to be tracked by police.

有些情况下，你可以使用一个装置发射无线电信号，让警察可以追踪被盗的车辆。

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Radio waves became known to scientists as Hertzian Waves. But the experiment was still of no use until Guglielmo Marconi improved on the device that created Hertzian Waves.

虽然赫兹电波作为无线电波已成为科学家们的共识，但在古列尔摩。马可尼对产生赫兹电波的装置加以改进之前，这项实验依然没有用途。

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