four velocity

例句：

1. 1. The car has a four-velocity transmission system.
   这辆车有一个四速变速器系统。
2. 2.The race car is designed to achieve the highest possible four-velocity.
   这款赛车设计成达到最高可能的四速。
3. 3.The four-velocity generator converts mechanical energy into electrical energy.
   四速发电机将机械能转换为电能。