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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	hedges hedging Hedin Hedjaz hedonic hedonical hedonics hedonism hedonisms -hedra -hedral -hedron -hedrons heebie-jeebies heebie–jeebies heeby–jeebies heed heeded heedful heeding heedless heeds heehaw heel heel

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