loose pulley
英 [luːs ˈpʊli]
美 [luːs ˈpʊli]
游（滑）轮；惰轮；空转（套）（皮带）轮；独立滑车
双语例句
- 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。