Wang Chen, a member of the Political Bureau of the Central Committee of the Communist Party of China and vice chairperson of the Standing Committee of the National People's Congress, speaks at the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims in Nanjing, capital of east China's Jiangsu Province, Dec. 13, 2018. (Xinhua/Ding Lin)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, east China's Jiangsu Province. (Xinhua/Ji Chunpeng)

　　Photo taken on Dec. 13, 2018 shows pigeons flying during the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, east China's Jiangsu Province. (Xinhua/Ji Chunpeng)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, east China's Jiangsu Province. (Xinhua/Ji Chunpeng)

　　Photo taken on Dec. 13, 2018 shows pigeons flying during the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, east China's Jiangsu Province. (Xinhua/Ji Chunpeng)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Li Bo)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Li Bo)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Li Bo)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Li Bo) (yxb)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Li Bo) (yxb)

　　China's national flag flies at half mast during the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province, Dec. 13, 2018. (Xinhua/Li Bo)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Yang Lei)

　　Photo taken on Dec. 13, 2018 shows the scene of the state memorial ceremony for China's National Memorial Day for Nanjing Massacre Victims at the memorial hall for the massacre victims in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Yang Lei)

　　People mourn for Nanjing Massacre victims during a memorial ceremony at the September 18th Historical Museum in Shenyang, capital of northeast China's Liaoning Province, Dec. 13, 2018, on the occasion of China's National Memorial Day for Nanjing Massacre Victims. (Xinhua/Qian Yi)

　　People mourn for Nanjing Massacre victims during a memorial ceremony at the September 18th Historical Museum in Shenyang, capital of northeast China's Liaoning Province, Dec. 13, 2018, on the occasion of China's National Memorial Day for Nanjing Massacre Victims. (Xinhua/Qian Yi)

　　Students light candles for Nanjing Massacre victims during a memorial ceremony at the September 18th Historical Museum in Shenyang, capital of northeast China's Liaoning Province, Dec. 13, 2018, on the occasion of China's National Memorial Day for Nanjing Massacre Victims. (Xinhua/Qian Yi)

　　Primary school pupils read the mourning oration for Nanjing Massacre victims during a memorial ceremony at the September 18th Historical Museum in Shenyang, capital of northeast China's Liaoning Province, Dec. 13, 2018, on the occasion of China's National Memorial Day for Nanjing Massacre Victims. (Xinhua/Qian Yi)