To restore a historic bridge from the Song dynasty, PHD students majoring in architecture went back to his hometown and many stories happened revolved the Restoration of the bridge.To restore a historic bridge from the Song dynasty, PHD students majoring in architecture went back to his hometown and many stories happened revolved the Restoration of the bridge.To restore a historic bridge from the Song dynasty, PHD students majoring in architecture went back to his hometown and many stories happened revolved the Restoration of the bridge.