hollow-pipe waveguide

例句：

1. 1. Hollow-pipe waveguides are commonly used in telecommunications to transmit signals over long distances.
   空心管道波导在电信中被广泛使用，用于长距离信号传输。
2. 2. The design of the hollow-pipe waveguide is crucial for the performance of the communication system.
   空心管道波导的设计对于通信系统的性能至关重要。
3. 3. In recent years, researchers have been exploring new materials and techniques to improve the efficiency andreliability of hollow-pipe waveguides.
   近年来，研究人员一直在探索新的材料和技术，以提高空心管道波导的效率和可靠性。