AGraduates line up to send flowers to teachers during the 2012 graduation ceremony at Tianjin University of Commerce in north China's Tianjin Municipality, June 20, 2012. (Xinhua/Liu Dongyue)

Two graduates share hugs during the 2012 graduation ceremony at Tianjin University of Commerce in north China's Tianjin Municipality, June 20, 2012. (Xinhua/Liu Dongyue)