triple transit echo

例句：

1. 1.The triple transit echo technique is used to measure the speed of sound in different materials.
   三重反射回声技术被用来测量不同材料中声速的速度。
2. 2. In the study of acoustics, the triple transit echo is a crucial tool for understanding how sound waves interact with matter.
   在声学研究中，三重反射回声是理解声波与物质相互作用的关键工具。
3. 3. The engineer used the triple transit echo to optimize the design of the new hearing aids.
   工程师利用三重反射回声来优化新型助听器的设计。