gas permeability of rocks
... 岩石突出：Rock projection 岩石透气性：gas permeability of rocks 岩石试验：Rock test ...
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南极地衣生活在多孔透气性好的砂岩里，它们钟情于朝北的岩石，因为这些岩石一整天能吸收阳光，加热维持热量。
These lichen live a fraction of an inch inside pieces of porous sandstone. They prefer north-facing stones, which absorb sunlight and heat up during the day.
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