piezoelectric vibrator

例句：

1. 1. This piezoelectric vibrator can be used to detect the presence of a person in a room.
   这个压电振动器可以用来检测房间内是否有人。
2. 2.The piezoelectric vibrator is used to measure the vibrations of objects.
   压电振动器用于测量物体的振动。
3. 3.The piezoelectric vibrator was invented by a scientist who wanted to create a device that could detect the presence of an object without touching it.
   压电振动器是由一位科学家发明的，他想创造一个设备，可以不触摸物体就检测到其存在。