This impervious layer or boundary will retard the free diffusion of moisture. This condition is referred to as case hardening.
这一不透气的壳层(或边界层)会阻滞水分自由扩散，这种情形称为表面硬化。
However, most of the diffusion-related NMR studies were limited to the free diffusion in simple systems.
然而，大部分扩散相关的NMR研究仅局限于简单体系的自由扩散行为。
However, most of the diffusion-related NMR studies were limited to the free diffusion in simple systems.
然而，大部分扩散相关的NMR研究仅局限于简单体系的自由扩散行为。
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