orbital quantum number

例句：

1. 1. The orbital angular momentum of an electron is important in physics.
   电子的轨道角动量在物理学中很重要。
2. 2. The orbital motion of the planets around the sun is governed by Kepler's laws.
   行星围绕太阳的轨道运动遵循开普勒定律。
3. 3. In quantum mechanics, the orbital energy levels of a particle are determined by its spin and its position on the atomic nucleus.
   在量子力学中，粒子的轨道能级由其自旋和其在原子核上的位置决定。