single sheave pulley block

例句：

1. 1. The engineer useda single-screw pulleyblock to adjust the tension of the rope.
   工程师使用了一个单根螺丝滑轮块来调整绳索的张力。
2. 2. The construction crewhad to replace the single-screw pulley block due to wear andtear.
   建筑工人不得不更换由于磨损而损坏的单根螺丝滑轮块。
3. 3. Thesingle-screw pulley blockwas designed to simplify the assembly process forthe machine.
   这个单根螺丝滑轮块的设计是为了简化机器的组装过程。