mainshaft gear bushing

例句：

1. 1. The engine's mainshaft gear is worn out, which affectsthe performance of the vehicle.
   发动机的主轴齿轮磨损，影响了车辆的性能。
2. 2. Mainshaft gear failure is a common problem inheavy-duty machinery.
   主轴齿轮故障是重型机械中常见的问题。
3. 3. Mainshaft gear bushing is an important componentthat ensures smooth operation of the engine.
   主轴齿轮衬套是确保发动机平稳运行的重要部件。