相对度量；相对距离

relative metric的用法和样例：

例句

The effective permeability is a relative measure of the conductance of the porous medium for one fluid phase when the medium is saturated with more than on fluid.有效渗透率是在多孔介质被多种流体饱和时，对单一流体相孔隙介质传导性的相对度量。

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atlas pistachia (pistacia atlantica)