narrow band subscriber terminal

例句：

1. 1.This narrow band subscriber terminal is used for data communication.
   这个窄带用户终端用于数据传输。
2. 2. The company has developed a new narrow band subscriber terminal to improve network performance.
   该公司已开发了一种新的窄带用户终端，以改善网络性能。
3. 3. The narrow band subscriber terminal is essential for maintaining the security of the network.
   窄带用户终端对于维护网络的安全性至关重要。