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.
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。
The Buyei folk literature in Luoping shows strong and unique deity consciousness for the solicitude of life, especially for the origin of all creatures and the switch of life.
罗平布依族民间文学在对生命的关怀层面上表现出浓烈而独特的神性意识，其中在对万物来源的认识及对生命的转换两大板块上体现尤为明显。
The Buyei folk literature in Luoping shows strong and unique deity consciousness for the solicitude of life, especially for the origin of all creatures and the switch of life.
罗平布依族民间文学在对生命的关怀层面上表现出浓烈而独特的神性意识，其中在对万物来源的认识及对生命的转换两大板块上体现尤为明显。
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