This review first summarizes the general theory of spin diffusion in solids, including semi-classical description and the more exact approach, i.
首先介绍固态中自旋扩散的一般理论，包括半经典描述和建立在投影算子理论上的密度矩阵描述。
Molecular diffusion also occurs in liquids and solids.
分子扩散同样也会在液体和固体中发生。
Molecular diffusion also occurs in liquids and solids.
分子扩散同样也会在液体和固体中发生。
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