| 单词 | pulley |
| 释义 | pulley n. & v. --n (pl. -eys) 1. a grooved wheel or set of wheels for a cord etc. to pass over, set in a block and used for changing the direction of a force. 2. a wheel or drum fixed on a shaft and turned by a belt, used esp. to increase speed or power. --vtr. (-eys, -eyed) 1. hoist or work with a pulley. 2. provide with a pulley. Etymology: ME f. OF polie prob. ult. f. med. Gk polidion (unrecorded) pivot, dimin. of polos POLE(2) |
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