engine gearbox

例句：

1. 1.The car's engine is a complex gearbox that needs regular maintenance.
   这辆车的引擎是一个复杂的齿轮箱，需要定期维护。
2. 2.The engineer used the gearbox to adjust the speed of the vehicle.
   工程师使用齿轮箱来调整车辆的速度。
3. 3. The gearbox was designed to improve fuel efficiency and reduce emissions.
   齿轮箱被设计用来提高燃油效率和减少排放。