| 单词 | pulley |
| 释义 | pulley (once / 3497 pages) n A pulley is a basic device or machine made of a wheel with a rim that a cord or rope fits around. The wheel and axle of a pulley make it easier to lift heavy objects with the rope. Ships and sailboats use pulleys — though they're often called drums — to make raising the sails less difficult. Flagpoles also have pulleys for raising and lowering the flag, many garage doors work by a pulley system, and loading docks and constructions sites use pulleys for lifting heavy things. Pulley comes from the Old French polie, with a Greek root of polidion, or "little pivot." WORD FAMILYpulley: pulleys USAGE EXAMPLESThe rod was attached to a cable connected to a pulley holding a 40-pound weight. Washington Times(Dec 31, 2016) We do a lot of the construction on the ground and pass boards up to each other and hoist sections up with pulleys and ropes. New York Times(Dec 09, 2016) Eventually, rescuers were able to help them down using ropes and pulleys. Washington Times(Nov 27, 2016) n 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 Syn|Hypo|Hyper block, pulley block, pulley-block bollock, bullock block a pulley-block at the head of a topmast fairleada pulley-block used to guide a rope forming part of a ship's rigging to avoid chafing idle pulley, idle wheel, idler pulleya pulley on a shaft that presses against a guide belt to guide or tighten it snatch blocka pulley-block that can be opened to receive the bight of a rope machine, simple machine a device for overcoming resistance at one point by applying force at some other point |
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