齿轮箱

例句：

1. 1. The car's engine is running smoothly because thegearbox has been serviced recently.
   汽车的引擎运行顺畅，因为齿轮箱最近已经检修过。
2. 2. The old truck hada worn-out gearbox that neededto be replaced.
   这辆旧卡车有一个磨损的齿轮箱，需要更换。
3. 3. Themechanic checked the gearbox and found nosigns of wear or damage.
   机械师检查了齿轮箱，没有发现任何磨损或损坏的迹象。