pulley cone

例句：

1. 1. The pulley cone is used to lift heavy objects.
   滑轮锥用于提升重物。
2. 2. The engineerdesigned the pulley cone to increase efficiency.
   工程师设计了滑轮锥以提高效率。
3. 3. Thepulley cone was installed in the machineto reduce friction.
   在机器中安装了滑轮锥以减少摩擦。