narrow-band channel

例句：

1. 1. The radio station broadcasts on a narrow-band frequency.
   该广播电台通过一个窄带频率进行广播。
2. 2. The military uses narrow-band signals to communicate with their forces.
   军队使用窄带信号与他们的部队进行通信。
3. 3. This narrow-band device is ideal for short-range communication.
   这种窄带设备非常适合短距离通信。