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词汇	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 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
随便看	pronging prongs prong–horned antelope pronograde pronominal pronominals pronoun pronounce pronounce pronounced pronounced pronounced pronouncement pronouncements pronounces pronouncing pronouncing pronto pronucleus pronunciamento pronunciamentoes pronunciamentos pronunciation pronunciations pronunciation spelling

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