combination buffer and draft gear

例句：

1. 1.The combination buffer and draft gear are essential for the smooth operation of the machine.
   组合缓冲器和草案齿轮对于机器的平稳运行至关重要。
2. 2.The engineers designed a new combination buffer and draft gear to improve efficiency.
   工程师们设计了一种新型的组合缓冲器和草案齿轮，以提高效率。
3. 3. The draft gear was used to adjust the speed of the motor, allowing it to run smoothly.
   草案齿轮被用来调整电机的速度，使其能够平稳运行。