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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	little little Little Alföld Little America little auk Little Bear Little Bighorn River Little Cayman Little Colorado River Little Diomede Island Little Dipper little finger Little Fork River Little Ice Age Little Kanawha River Little Karroo little magazine Little Minch Little Missouri River Little Namaqualand littleneck littleneck clam little owl Little Pee Dee River littler

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