People visit an art exhibition marking the 80th anniversary of the Nanjing Massacre at the Museum of the War of Chinese People's Resistance against Japanese Aggression in Beijing, capital of China, Dec. 13, 2017. (Xinhua/Luo Xiaoguang)

Students of Beijing No. 35 High School visit an art exhibition marking the 80th anniversary of the Nanjing Massacre at the Museum of the War of Chinese People's Resistance against Japanese Aggression in Beijing, capital of China, Dec. 13, 2017. (Xinhua/Luo Xiaoguang)