With the exception of sunlight and starlight, however, light usually is the result of changes in the electronic structure of atoms and molecules as they absorb and readmit energy.

• 然而,除了日光和星光以外,光通常是电子排列改变的结果,当原子或分子吸收和重新接纳能量时在原子或分子里的电子排列就发生变化。