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This Green Chanel is like a "exit passageway", because of this ,social vuln-erable groups could get on or get off the subway without being squeezd or pushed down at a croweded situation.Instead of provid some products to stabilize public orders ,it make a tiny changes from the ground of the subway station to remind people caring social vulnerable groups. Sometimes a tiny chage leads to tremendas love.
Zhou Peng Dai Can