pulley block
近义词：pulley，pulley-block，block，
英英释义
Noun
- a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
例句
用作名词(n.)
- Crevasse rescue is one of the more complicated mountaineering techniques, sometimes requiring pulley systems and multiple haul lines.裂缝救援是一项更副复杂一些的登山技术，有时候需要滑轮组和多组拖曳绳。
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