基态波函数可以表示为沿这条确定轨迹的一系列积分，而能量则可以用位势极小值处的一系列微分表示。

The ground state wave function can be expressed as a series of integrations along the trajectory and the energy as a series of differentials at the minimum of the potential.

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现在可以看到，全微分里面的这些偏导数系数，都可以用一个变量表示出来。

Now you see how the total differential accounts for, somehow, all the partial derivatives that come as coefficients of the individual variables in these expressions.

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利用微分法我们可以，表示出这种情况下的df和dz的关系。

Using differentials means that we will try to express df in terms of dz in this particular situation.

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