1·Imagine a belt running over a pulley and catching some loose debris and forcing it around the pulley.
想象一下，一个滑轮皮带运行和捕捉一些松散的碎片，并迫使它周围的滑轮。
2·The utility model aims to provide a girdle pulley board, the pulleys of which will not get loose when the pulley board is tightened.
目的在于提供一种滑轮不会因 用力拉紧滑轮板而松脱的腰带滑轮板。