Pulley

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GRE

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[编辑] GRE 红宝书

  • n.滑轮, 滑车
  • [英] n.滑轮, 滑车 ( a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim[轮缘])
  • [记] pull ( 拉) +ey

[编辑] Webster Collegiate

noun (plural pulleys)

  • Etymology: Middle English poley, pully, from Anglo-French pulie, probably ultimately from Greek polos axis, pole — more at pole
  • Date: 14th century
  • 1. a sheave or small wheel with a grooved rim and with or without the block in which it runs used singly with a rope or chain to change the direction and point of application of a pulling force and in various combinations to increase the applied force especially for lifting weights
  • 2. a pulley or pulleys with ropes to form a tackle that constitutes one of the simple machines
  • 3. a wheel used to transmit power by means of a band, belt, cord, rope, or chain passing over its rim


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