(亦作 pulley wheel)a wheel with a grooved rim around which a cord passes, which acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights 滑轮,滑车 ■a wheel or drum fixed on a shaft and turned by a belt, used especially to increase speed or power 皮带轮
(-eys, -eyed)
[with obj.]hoist with a pulley 用滑轮升起(或绞起)
语源
Middle English: from Old French polie, probably from a medieval Greek diminutive of polos 'pivot, axis'