friction draft gear

例句：

1. 1. The friction draft gear is essential for the efficient operation of the oil drilling equipment.
   摩擦式抽油机齿轮对于石油钻探设备的高效运行至关重要。
2. 2.The engineers carefully adjusted the friction draft gear to ensure optimal performance.
   工程师们仔细调整了摩擦式抽油机齿轮，以确保最佳性能。
3. 3. The friction draft gear was designed to reduce wear and extend the lifespan of the equipment.
   摩擦式抽油机齿轮被设计来减少磨损并延长设备的使用寿命。