variable frequency vibrator

例句：

1. 1. The variable frequency vibrator is used to control the speed of the motor.
   可变频率振动器用于控制电机的速度。
2. 2. The variable frequency vibrator is an essential tool for testing electronic components.
   可变频率振动器是测试电子元件的必备工具。
3. 3. The variable frequency vibrator can be used to measure the vibration level of a machine.
   可变频率振动器可以用来测量机器的振动水平。