sliding block

例句：

1. 1. The car's engine is a sliding block that needs to be replaced regularly.
   汽车的引擎是一个需要定期更换的滑动块。
2. 2. The engineer used a sliding block to make the machine work more efficiently.
   工程师使用一个滑动块使机器工作得更有效。
3. 3. The scientist discovered a new sliding block that could reduce friction in the moving parts.
   科学家发现了一种新的滑动块，可以减少移动部件之间的摩擦。