drop vlave engine

例句：

1. 1. The new vlave engine is expected to improve fuel efficiency significantly.
   新型发动机预计将显著提高燃油效率。
2. 2. The car's vlave engine has been upgraded for better performance.
   汽车的发动机已升级以获得更好的性能。
3. 3. The vlave engine is responsible for powering the vehicle's propulsion system.
   发动机负责为车辆的动力系统提供动力。