一种有一个拉绳或链子穿过的有槽的轮子且通过改变拉力的方向而拉起重物的简单机械

一种有一个拉绳或链子穿过的有槽的轮子且通过改变拉力的方向而拉起重物的简单机械的英文翻译

基本释义

• a simple machine consisting essentially of a wheel with a grooved rim in which a pulled rope or chain can run to change the direction of the pull and thereby lift a load