It is assumed that the emission and absorption of light energy by an atom or molecule is not a continuous precess but occurs in steps.
假定原子或分子发射光能和吸收光只能不是一个连续的过程，而是阶梯式发生的。
It is assumed that the emission and absorption of light energy by an atom or molecule is not a continuous precess but occurs in steps.
假定原子或分子发射光能和吸收光只能不是一个连续的过程，而是阶梯式发生的。
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