| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024pul•ley /ˈpʊli/USA pronunciation n. [countable], pl. -leys. - Mechanical Engineeringa wheel for supporting, guiding, or transmitting force to or from a moving rope or cable that rides in a groove in its edge.
WordReference Random House Unabridged Dictionary of American English © 2024pul•ley (pŏŏl′ē),USA pronunciation n., pl. -leys. - Mechanical Engineeringa wheel, with a grooved rim for carrying a line, that turns in a frame or block and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines.
- Mechanical Engineeringa combination of such wheels in a block, or of such wheels or blocks in a tackle, to increase the force applied.
- Mechanical Engineeringa wheel driven by or driving a belt or the like, used to deliver force to a machine, another belt, etc., at a certain speed and torque.
- Middle French polie Medieval Greek *polídion little pivot, equivalent. to pól(os) pole2 + -idion diminutive suffix
- Middle English poley, puly 1275–1325
Collins Concise English Dictionary © HarperCollins Publishers:: pulley /ˈpʊlɪ/ n - 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
- a number of such wheels pivoted in parallel in a block, used to raise heavy loads
- a wheel with a flat, convex, or grooved rim mounted on a shaft and driven by or driving a belt passing around it
Etymology: 14th Century poley, from Old French polie, from Vulgar Latin polidium (unattested), apparently from Late Greek polidion (unattested) a little pole, from Greek polos axis |