也可以dy，dx来划分，或者,对变量做一下变化，移动到原点，就是把x变成,然后再转化成极坐标。
We could do it dy dx. Or, maybe we will want to actually make a change of variables to first shift this to the origin, x-2 you know, change x to x minus two and then switch to polar coordinates.
图象中的动目标可以通过雷达回波的频谱特性进行分析、检测和分离，并能将动目标频谱移动到原点。
In SAR image moving targets can be analysised, detected and detached by spectrum characteristics of the radar echoes, and the spectrum of moving tar-gets can be shifted to the origin.
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