In particular, the space is characterized by horizontal distribution of projective sphere bundle to have flat foliation.
特别地，这个空间可以由摄影球丛具有平坦的叶状结构的水平分布来刻划。
In particular, the space is characterized by horizontal distribution of projective sphere bundle to have flat foliation.
特别地，这个空间可以由摄影球丛具有平坦的叶状结构的水平分布来刻划。
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