mainshaft synchronizer gear sleeve

例句：

1. 1. The mainshaft synchronizing gear sleeve is essential for ensuring the proper operation of the engine.
   主轴同步器齿轮套筒对于确保发动机正确运行至关重要。
2. 2. The technician carefully removed the mainshaft synchronizing gear sleeve to replace the worn part.
   技术人员小心翼翼地取下了主轴同步器齿轮套筒，以更换磨损的部分。
3. 3. The new mainshaft synchronizing gear sleeve has significantly improved the performance of the vehicle.
   新的主轴同步器齿轮套筒显著提高了车辆的性能。