radio wave propagation

例句：

1. 1. The signal travels through the air waves and reaches the receiver.
   信号通过空气波到达接收器。
2. 2. This technology is used to transmit radio waves over long distances.
   这项技术用于在远距离传输无线电波。
3. 3. The scientists used a special device to detect the radio wave propagation.
   科学家们使用一种特殊的设备来探测无线电波的传播。