ultrasonic pen pointer

例句：

1. 1.The ultrasonic pen pointer is usedto measure distance in the field of medicine.
   超声波笔指针用于医学领域的测量距离。
2. 2.The ultrasonic pen pointer is auseful tool for measuring distance and anglesin the field of engineering.
   超声波笔指针是工程领域测量距离和角度的一种有用的工具。
3. 3. The ultrasonic pen pointercan be used to detect defects in materialsand identify areas where repairs are needed.
   超声波笔指针可以用来检测材料中的缺陷，并识别需要修复的区域。