block and tackle
n.
An apparatus of pulley blocks and ropes or cables used for hauling and hoisting heavy objects.
block and tackleHalf the pull (p) is required to lift the weight (w) with a two-pulley block and tackle unit.
| 单词 | block and tackle |
| 释义 | block and tackle n. An apparatus of pulley blocks and ropes or cables used for hauling and hoisting heavy objects. block and tackleHalf the pull (p) is required to lift the weight (w) with a two-pulley block and tackle unit. |
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