sliding pulley

例句：

1. 1. The car's engine is powered by a sliding pulley system.
   汽车的引擎通过一个滑动滑轮系统来驱动。
2. 2. The engineer used a sliding pulley to lift the heavy machine.
   工程师使用了一个滑动滑轮来提升这台重型机器。
3. 3. The train uses a sliding pulley to move its wheels up and down.
   火车使用滑动滑轮来使车轮上下移动。