Li Zhong (2nd L, front), a 99-year-old alumnus of the National Southwest Associated University, a wartime union of universities which included Peking University (PKU), attends a ceremony marking the 120th anniversary of PKU at the Peking University Khoo Teck Puat Gymnasium in Beijing, capital of China, May 4, 2018. (Xinhua/Shen Bohan)