利用保角变换，首先在二维平面得到双曲线型的等位线簇方程，然后过渡到三维空间，从而得到表面为单叶双曲面（两实半轴相等）的带电导体的等位面簇方程。
Transition to the three-dimensional space, then we obtain the equation of equipotential surface families of charged conductor with surface of hyperboloid of one sheet.
普通股内部也有诸多子分类，但实入资本与留存收益是两个最大的部分。
Although there are several categories within equity, the two biggest are paid-in capital and retained earnings.
即使在此次粮价开始上涨的两年前，食品援助已处于历史较低水平，以实值计算或许只有二十年前的一半。
Even before the current price boom started two years ago, food aid was running at historically low levels, perhaps half the real-terms total of two decades earlier.
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