ring spring draft gear

例句：

1. 1.The new design of the ring spring draft gear has greatly improved the efficiency of the pumping system.
   新型的弹簧式抽油机齿轮设计大大提高了泵送系统的效率。
2. 2. The ring spring draft gear is crucial for maintaining the stability of the oil well.
   弹簧式抽油机齿轮对于保持油井的稳定性至关重要。
3. 3. The engineers have been working on developing a more efficient ring spring draft gear to reduce maintenance costs.
   工程师们一直在努力开发一种更高效的弹簧式抽油机齿轮，以降低维护成本。