pulley/ˈpulɪ; `pʊlɪ/ n1 (apparatus consisting of a) wheel or wheels with grooves for ropes or chains, used for lifting things 滑轮（组）; 滑车.2 wheel or drum fixed on a shaft and turned by a belt, used esp to increase speed or power 皮带轮.
牛津英汉双解词典