第一层的电导率可以相继用三个离散的电导率转换函数值计算，并取其平均值；
The conductivity of the first layer is determined from the arithmetic mean of the successive computation which are carried on each of three successive discrete conductivity transform values.
换句话说，如果我得到了Q的表达式，知道了配分函数，我可以计算它在任意温度下的数值。
In other words, if I have an expression for Q, I know the partition function, and I can calculate it at any temperature.
如果有一个梯度场，然后想计算线积分，我知道积分值是,起点的函数值减去终点的函数值。
Well, if I have a gradient field, then if I try to compute this line integral, I know it will be the value of the function at the end point minus the value at the starting point.
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