urning

例句：

1. 1. The car's engine is a hydraulic urning.
   汽车的引擎是一个液压转轮。
2. 2.The machine has a large urning that rotates the gears.
   这台机器有一个大的滚筒，它旋转齿轮。
3. 3.The urning on the conveyor belt is responsible for moving the goods.
   传送带上的滚筒负责移动货物。