而收音机的天线就是这样工作的，只不过电波所产生的电流非常弱，需要进一步放大从而完成信号传输。
Indeed, that is how a radio antenna works, except that the weak current generated by the radio waves has to be amplified to do its job of carrying a signal round a radio.
由于变换器工作在平均电流控制的APFC系统中，本文建立了BUCBB变换器的大信号动态模型，并将BUCBB变换器中的开关元件用受控源代替。
On account of the average current control chosen in the APFC system, a large signal dynamic BUCBB model is built and all the switching elements replaced by dependent sources.
监测系统工作原理是通过监测电缆放电信号和直流泄漏电流信号综合评估电缆绝缘状态。
The working principle of the developed monitoring system is to assess comprehensively the insulation status of DC feeder cable through monitoring discharge signal and DC leakage current signal.
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