friction key

例句：

1. 1.The friction key is used to make the machine run smoothly.
   摩擦键用于使机器运行平稳。
2. 2. The friction key is essential for ensuring the smooth operation of the device.
   摩擦键对于确保设备的顺畅运行至关重要。
3. 3. The friction key was designed to minimize wear and tear on the moving parts.
   摩擦键的设计旨在最小化对移动部件的磨损。