planker

例句：

1. 1. The planker is the part of a pulley system that allows for the lifting and moving of objects.
   滑轮是滑轮系统的组成部分，用于提升和移动物体。
2. 2. The engineer designed a new planker to improve efficiency in the factory.
   工程师设计了一个新的滑轮以提高工厂的效率。
3. 3.The planker was used to lift heavy loads from one side of the building to the other.
   滑轮被用来从建筑物的一侧将重物提升到另一侧。