发射器朝目标方向发射一定频率的无线电波。
Transmitters emit waves of a certain frequency in the direction of the target.
其中呼之欲出的方案就是利用无线电波输电，因为Wi - Fi通信所使用的发射器和接收器，原则上也同样适用。
The use of radio waves to transmit electricity is perhaps the most obvious solution, since you can in principle use the same kinds of transmitters and receivers used in Wi-Fi communication.
地球成了无线电波(电视、手机以及雷达传输器)的密集发射器。
The planet became an intense emitter of radio waves (TV, cellphone, and radar transmissions.)
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