单词	block and tackle
释义	block and tackle noun A lifting mechanism consisting of ropes, a pulley block, and a hook.We have bent a number of bows using a steam box and a jig with a block and tackle and pulleys to bend them around a form.... There was clearly no time to rig a block and tackle to winch the casualty on board. A block and tackle can contain as many pulleys as you like, although at some point the amount of friction in the pulley shafts begins to become a significant source of resistance.
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