compound pulley

例句：

1. 1. The compound pulley systemis used to lift heavy objects.
   复合滑轮系统用于提升重物。
2. 2. The engineerdesigned the compound pulley to increase efficiency.
   工程师设计了复合滑轮以提高效率。
3. 3.The compound pulley was a revolutionary inventionthat changed the way we lift things.
   复合滑轮是一项革命性的发明，改变了我们提起物品的方式。