narrow-band ping

例句：

1. 1. In the early days of wireless telegraphy, narrow-band ping was used to transmit short messages over long distances.
   在无线电电报的早期，窄带ping被用来在长距离上传输简短的信息。
2. 2. The engineers were using a narrow-band ping system to monitor the performance of the new transmissionline.
   工程师们正在使用一种窄带ping系统来监测新传输线路的性能。
3. 3. The company's research team is working on developing a more efficient narrow-band ping algorithm for its network equipment.
   该公司的研究团队正在开发一种更高效的窄带ping算法，用于其网络设备。