double frequency

例句：

1. 1.The double frequency of the signal is crucialfor accurate communication.
   信号的双倍频率对于准确的通信至关重要。
2. 2. The double frequency of theradio waves is used to transmit data overlong distances.
   无线电波的双倍频率被用来在远距离上传输数据。
3. 3. Thedouble frequency of the microwaves is usedin radar systems to detect objects in theair.
   微波的双倍频率被用于雷达系统中，以检测空中物体。