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单词 block and tackle
释义 block and tacklen.(名词)Half the pull (p) is required to lift the weight (w) with a two single-block and tackle unit.Precision Graphics
  1. An apparatus of pulley blocks and ropes or cables used for hauling and hoisting heavy objects.辘轳,滑车装置:一种以滑轮和绳子或缆索构成的器具,用来拖拉和吊升重物
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