pulley|pulleys

工人们用滑轮把沉重的箱子吊到二楼。

The workers used a ___pulley to lift the heavy boxes to the second floor.

我们用滑轮把重箱子吊上了阁楼。

We used ___pulleys to lift the heavy box up to the attic.

工人们用滑轮把建筑材料吊到屋顶上。

The workers used a ___pulley to lift the building materials up to the roof.