| 释义 |
定滑轮dìnghuálún位置固定的滑轮,使用时轮子转动而整个滑轮不发生位移。使用这种滑轮能够改变力的方向,但不能省力,也不能缩短路程。{fixed pulley; pulley at a fixed position that turns without changing its position; such a pulley can change the direction of a force, but cannot save energy or reduce the distance} |