fixed-displacement oil motor

例句：

1. 1. Thenew car has a fixed-displacement engine that delivers strong performance.
   这款新车配备了一个固定排量发动机，性能强劲。
2. 2. The old model is still popular because of its fixed-displacement design.
   旧型号仍然很受欢迎，因为它的固定排量设计。
3. 3.The fixed-displacement oil motor is used in many industrial applications where precise speed control is required.
   固定排量油马达被广泛应用于需要精确速度控制的工业应用中。