fixed temperature levels中文什么意思

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the testing results show that the porosity of sandstone decreases with increasing effective stress at the fixed temperature level, following the law of negative exponent . however, at the fixed effective stress level, the effect of temperature on the porosity of sandstone is very small ( 37.6 temperature variation )
试验结果表明，有效应力对砂岩孔隙度的影响较大，在温度一定的情况下，砂岩的孔隙度随有效应力的增加而呈负指数规律减小；而温度变化(本试验中的温度变化范围为37.6)对砂岩孔隙度的影响很小。
at the fixed temperature level, both the permeability and hydraulic conductivity of sandstone decrease with the increasing effective stress, following the law of negative exponent . at the fixed effective stress level, however, the function between hydraulic conductivity and temperature is not a monotone one
在温度一定的条件下，砂岩的渗透率和水力传导系数均随有效应力的增加而呈负指数规律减小，但在有效应力一定的条件下，水力传导系数与温度之间的关系函数并非单调函数。

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