expansion gear

例句：

1. 1.The new model car has a more powerful engine that can be used for both driving and towing.
   新款汽车拥有更强大的发动机，既可以用于驾驶也可以用于拖拽。
2. 2.The company is expanding its production capacity to meet the increasing demand in the market.
   该公司正在扩大生产能力以满足市场上不断增长的需求。
3. 3.The expansion gear is designed to increase the vehicle's power output without compromising fuel efficiency.
   扩张齿轮设计用来增加车辆的输出功率，同时不牺牲燃油效率。