百度_狄少华吧_又续 ... polar conic 极圆锥曲线 polar conjugate points 极共轭点 polar coordinate system 极坐标系 ...
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以上来源于: WordNet
The town's name had been changed from Boronsk to Marx to Pokrovsk and then to Engels the name of Marx's German collaborator being thought appropriate for the capital city of the Volga Germans.
ECONOMIST: Alfred Schnittke
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