ultrasonic film thickness gauge

例句：

1. 1. Ultrasonic waves are used in medical imaging.
   超声波用于医学成像。
2. 2. The ultrasonicdetector is sensitive to sound waves.
   超音波探测器对声波敏感。
3. 3. Ultrasonic equipment is used for testing materials.
   超音设备用于测试材料。