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This is a portable swimming laps. When it is not used, it is a rolled-up frame,
with a circular, compressed air bag. When using, untie the rope,and the frame
outside through elastic will become a circle.
Xiaowei Wu，Caixiang Ding，Rufeng Dai，Ziyun Yan，Dunqi Lu，Wenjie Zhang，Dawei Pan，Huanghao Jin，Qionglei Zhu