second-motion engine

例句：

1. 1. The second-motionengine is responsible for the vehicle'sacceleration and deceleration.
   第二动力引擎负责车辆的加速和减速。
2. 2. The second-motion engine is a crucial component of thecar's powertrain system.
   第二动力引擎是汽车动力传动系统的关键部件。
3. 3. Thesecond-motion engine has been optimized toimprove fuel efficiency and reduce emissions.
   第二动力引擎经过优化，以提高燃油效率并减少排放。