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pulley n.滑轮，滑车，皮带轮

释义2： pulley
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◙ (pl. -eys)
1. (也作 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)
1. [with obj.] hoist with a pulley
• 用滑轮升起（或绞起）1. Middle English: from Old French polie, probably from a medieval Greek diminutive of polos 'pivot, axis'

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