| 单词 | pulley |
| 释义 | Word Frequency pulley(ˈpʊlɪ) noun 1. a wheel with a grooved rim in which a rope, chain, or belt can run in order to change the direction or point of application of a force applied to the rope, etc 2. a number of such wheels pivoted in parallel in a block, used to raise heavy loads 3. a wheel with a flat, convex, or grooved rim mounted on a shaft and driven by or driving a belt passing around it Word origin C14 poley, from Old French polie, from Vulgar Latin polidium (unattested), apparently from Late Greek polidion (unattested) a little pole, from Greek polos axis |
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