stepless speed change

例句：

1. 1.The car has a stepless speed change, which makes it easy to accelerate and brake.
   这辆车有无级变速器，这使得加速和刹车变得很容易。
2. 2. The new model of the car features a stepless speed change system that improves fuel efficiency.
   这款汽车的新型号配备了一个无级变速器系统，提高了燃油效率。
3. 3. The driver can easily control the vehicle's speed with the stepless speed change feature.
   司机可以通过无级变速器功能轻松控制车辆的速度。