stepless speed adjusting gear

例句：

1. 1. The car has a stepless speed adjusting gear that allows for smooth acceleration.
   这辆车有一个无级变速器，可以提供平稳的加速。
2. 2. The new model of the car features a stepless speed adjusting gear, which is more efficient and eco-friendly.
   这款新车配备了无级变速器，更高效且环保。
3. 3. The engineers worked tirelessly to develop a stepless speed adjusting gear that could meetthe demands of modern transportation.
   工程师们不懈努力，研发出一种无级变速器，以满足现代交通的需求。