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In China,because of the traffic jam the buses always come in a line,
we don’t know what’s the number behind us.So we can not quickly catch the
bus.Or when we run to the bus station the bus number are some times hided.
ROTATE DOOR PLATE is connected to the top of a door When the door
is opened it will be turned out, people can see the blocked bus is or
not the number we want
Xujiang Zhao Lin Pan Jingwen Wang Fei Han