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The other warning device is a radio signal to the water plant.
另一个警报设备是通向污水厂的无线电。
youdao
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BEACON, a device which emits a signal for use as a guidance or warning aid.
信标，发射引导或警告用信号的装置。
youdao
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BEACON, a device which emits a signal for use as a guidance or warning aid.
信标，发射引导或警告用信号的装置。
youdao