有凹槽使得作用在绳子上的力量能够改变方向的轮状简单机械。

有凹槽使得作用在绳子上的力量能够改变方向的轮状简单机械。的英文翻译

基本释义

• a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.