In this paper, three-phase voltage will be corresponded to the three-dimensional space vector in the three-dimensional space coordinate.
本文采用基于三维空间坐标的功率理论，即三相电压对应到三维空间坐标中的三维空间矢量。
I have a vector which is in three-dimensional space.
假设有一矢量，在三维空间中。
It is hard to draw in two dimensions a picture of a vector function in three-dimensional space.
在两维图上画三维空间的矢函数图形是件难事。
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