retarding-field oscillator

例句：

1. 1.The retarding-field oscillator is used to control the speed of a vehicle.
   减速场振荡器用于控制车辆的速度。
2. 2.The engineer designed the retarding-field oscillator to improve the efficiency of the machine.
   工程师设计了减速场振荡器以提高机器的效率。
3. 3. The retarding-field oscillator was used to detect the presence of foreign objects in the air.
   减速场振荡器被用来检测空气中的外来物体的存在。