ultrasonic test of concrete strength

例句：

1. 1. Ultrasonicwaves are used to detect defects in metals.
   超声波用于检测金属中的缺陷。
2. 2. Theultrasonic scanner is used toexamine the inside of the human body.
   超声波扫描仪用于检查人体内部。
3. 3. Ultrasonic technology has revolutionized the way wecommunicate with each other.
   超声波技术已经改变了我们彼此交流的方式。