If the infiltration intensity is less then the saturated permeability coefficient, the surface soil finally reaches to an unsaturated infiltration stage instead of saturated infiltration stage.

当降雨强度小于土体的饱和渗透系数时，表层土体达不到饱和状态，最终的稳定入渗只能达到一个非饱和入渗状态。

youdao

The permeability barrier of the stratum corneum is mostly formed by saturated lipids such as ceramides, cholesterol and free fatty acids.

角质层的渗透屏障大多是由饱和脂质如神经酰胺、胆固醇和游离脂肪酸组成。

youdao

For complexity and diversity of unsaturated soil behaviors, there lies a great difference in permeability characteristics between unsaturated soil and saturated soil.

由于非饱和土的复杂性和多变性，其渗透特性明显不同于饱和土，并且试验难度较大。

youdao