coupler and draft gear

例句：

1. 1. Thenew design of the coupling and draft gearhas greatly improved the efficiency of the machine.
   新型的耦合器和抽气机设计大大提高了机器的效率。
2. 2. The engineers carefully inspected thecoupling and draft gear to ensurethey were working properly.
   工程师们仔细检查了耦合器和抽气机，确保它们正常工作。
3. 3. The team worked tirelesslyto replace the old coupling and draft gearwith new ones.
   团队努力不懈地用新的耦合器和抽气机替换旧的。