narrow-band magnitude

例句：

1. 1. The narrow-band signal is very important for communication.
   窄带信号对于通信非常重要。
2. 2. The narrow-band signal is used in many applications such as telecommunications and radar.
   窄带信号在许多应用中都有使用，比如电信和雷达。
3. 3. The narrow-band signal has a high resolution and can be easily transmitted over long distances.
   窄带信号分辨率高，可以很容易地通过长距离传输。