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Scarlett Lee——Studied at the University of Vienna, Lives in Vienna, Austria.
A pulley is a wheel with a groove along its edge, that holds a rope or cable. Usually, two or more pulleys are used together. When pulleys are used together in this way, they reduce the amount of force needed to lift a load. A crane uses pulleys to help it lift heavy loads.read more >>+119962023-04-27 00:05:23
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