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When city streets are flooded, the well lids submerged by muddy water are often washed away，that makes people escaping in the street worry about falling into the wells. Caution hoop is designed for this case, if the lids are washed away，the warning buoy will rise to prompt people bypass the area.
Xu Tianning; Zhu Pengfei; Guan Hongyue; Kong Ying