不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。
Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.
这一照片故事显示在阿富汗和巴基斯坦偏远地区以及在两国之间可渗透边境一带开展脊髓灰质炎预防接种运动的情况。
This photo story shows how the polio vaccination campaign was organized in remote regions of Afghanistan and Pakistan and along the porous border between the two countries.
在这种情况下，水会通过可渗透材料或裂缝渗出，影响了在上部水压力作用下的隧道施工进度。
In such cases, water seeps through porous material or crevices, subjecting the work in progress to the pressure of the water above the tunneling path.
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