fast and loose pulley

例句：

1. 1. The fast and loose pulley systemallows for easy adjustment of the tension.
   快速且松垮的滑轮系统允许轻松调整张力。
2. 2. The quick-revolvingpulley is used in many industrial applicationsto reduce wear on moving parts.
   快速旋转的滑轮在许多工业应用中被使用，以减少移动部件的磨损。
3. 3.In this design, the fast-moving pulley is mounted at the topof the frame, while the slow-moving pulley is located at thebottom.
   在这个设计中，快速移动的滑轮安装在框架顶部，而慢速移动的滑轮位于底部。