They are free of turbidity, except in some limestone areas and volcanic areas with high secondary permeability where large underground rivers occur.
它们不至于浑浊、只是在灰岩地区和火山地区具有高的次生渗透性并存在大地下河时除外。
They are free of turbidity, except in some limestone areas and volcanic areas with high secondary permeability where large underground rivers occur.
它们不至于浑浊、只是在灰岩地区和火山地区具有高的次生渗透性并存在大地下河时除外。
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