当然了，最佳选择是用单位圆盘。
Now, of course the smart choice would be to just take the flat unit disk.
因为它是一个单位圆盘，这部分的中心就是圆盘的中心。
because it's a unit disk. And, the center of mass is the center of a disk.
本文使用不变加权面积平均值性质刻画了单位圆盘内的调和函数。
In this paper, we give a condition for harmonic functions in the unit disk by invariant weighted area-mean-value property.
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