channel map

例句：

1. 1. The channel map shows the distribution of radio signals across different frequencies.
   频道地图显示了不同频率上的无线电信号分布。
2. 2. The engineer used a channel map to determine the optimal transmission path.
   工程师使用频道地图来确定最佳的传输路径。
3. 3. The channel map helps us understand the propagation characteristics of wireless signals.
   频道地图帮助我们理解无线信号的传播特性。