roll-adjusting gears

例句：

1. 1.The car's engine is a roller-adjusting gears that can be adjusted to fit different driving conditions.
   汽车的引擎是一个可调节的滚轮式齿轮，可以根据不同的驾驶条件进行调整。
2. 2.The new transmission system uses roller-adjusting gears to improve fuel efficiency.
   新的传动系统使用滚轮式调整齿轮来提高燃油效率。
3. 3. The engineers replaced the old gears with roller-adjusting gears to reduce noise and improve performance.
   工程师们用滚轮式调整齿轮替换了旧的齿轮，以减少噪音并提高性能。