... ordinary axis of symmetry 普通对称轴 ; 常对称轴 secondary axis of symmetry 次对称轴 threefold axis of symmetry 三重对称轴 ...
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secondary axis of total symmetry 全对称次对称轴
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The Palace Museum is 3800 metres long, the entire buildings according to the north and south in the middle of the central axis of symmetry layout, distinct, primary and secondary order.
故宫长3800米，整个建筑群按南北中间的中轴线为对称布局，层次分明，主次有序。
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