a wheel or set of wheels over which a rope or chain is pulled in order to lift or lower heavy objects 滑轮;滑轮组;滑车 a system of ropes and pulleys 绳索滑轮系统 The scenery was moved across the stage by ropes and pulleys. 布景被绳子和滑轮移过舞台。 a system of chains passing over pulleys 穿过滑轮的链条系统
Word OriginMiddle English: from Old French polie, probably from a medieval Greek diminutive of polos ‘pivot, axis’.