gear set case

例句：

1. 1. The car's engineis running smoothly because the gear set casehas been replaced.
   汽车的引擎运行顺畅，因为齿轮组已经更换。
2. 2. The engineercarefully inspected the gear set case toensure it was functioning properly.
   工程师仔细检查了齿轮组以确保其正常工作。
3. 3. Thenew gear set case has improved the vehicle's performance significantly.
   新的齿轮组显著提高了车辆的性能。