pole chain

例句：

1. 1. The pole chain is used to secure the roof of the building.
   杆链用于固定建筑物的屋顶。
2. 2.The workers used the pole chain to lift the heavy box.
   工人们使用杆链来抬起沉重的箱子。
3. 3. The pole chain was a crucial part of the construction project.
   杆链是建筑项目的关键部分。