Chinese President Xi Jinping (4th L, front), and Yu Zhengsheng (4th R, front), chairman of the National Committee of the Chinese People's Political Consultative Conference, attend a state memorial ceremony to mark the 80th anniversary of the Nanjing Massacre in Nanjing, capital of east China's Jiangsu Province, Dec. 13, 2017. (Xinhua/Xie Huanchi)