acoustic Mach meter

例句：

1. 1.The acoustic Mach meter is used to measure the speed of sound in air.
   声学马赫计用于测量空气中声速的速度。
2. 2. The acoustic Mach meter was used to detect the presence of a gas leak in the factory.
   声学马赫计被用来检测工厂中气体泄漏的存在。
3. 3. The acoustic Mach meter is an essential tool for measuring the speed of sound in various materials.
   声学马赫计是测量各种材料中声音速度的必备工具。