In some cases, however, the quantitatively ac-curate results necessitate the density matrix theory and the semiclassical model.
但在一些场合下，取半经典和密度矩阵模型对进行定量的计算是十分必要的。
In some cases, however, the quantitatively ac-curate results necessitate the density matrix theory and the semiclassical model.
但在一些场合下，取半经典和密度矩阵模型对进行定量的计算是十分必要的。
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