| 单词 | pulley |
| 释义 | pulley —pulleyless, adj. /pool"ee/, n. , pl. pulleys. 1. a 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. 2. a combination of such wheels in a block, or of such wheels or blocks in a tackle, to increase the force applied. 3. a 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. [1275-1325; ME poley, puly < MF polie << MGk *polídion little pivot, equiv. to pól(os) POLE2 + -idion dim. suffix] |
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