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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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更新时间:2024/12/23 22:00:16