例句與造句

1. Orbital angular momentum vector
   軌道角動量矢量
2. In the motion , the direction of angular momentum vector changes every moment , because there is a torque caused by gravity act on the wheel , then the wheel rotate itself and rotate around the fixed point
   車輪進動實驗：在進動中，角動量的矢量方向不斷改變，是因為受到一個由重力產生的力矩，使車輪在自轉的同時又繞支點轉動。
3. It's difficult to find angular momentum vector in a sentence. 用angular momentum vector造句挺難的