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WHICH指代什么?是porosity 还是permeability?

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WHICH指代什么?是porosity 还是permeability?
the proportion of empty space in a rock is known as its porosity.But note that porosity is not the same as permeability,which measures the ease with which water can flow through a material;
WHICH指代什么?是porosity 还是permeability?
porosity
再问: 为什么?
再答: porosity是 主语
再问: 没有逗号,就是permeability了吗?
再答: 对的
再问: 没有逗号,就是permeability了吗?