Zhang Jianjun, curator of the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, shows a copy of the report documenting how chemical weapons were used by the Japanese Army in China during World War II in Nanjing, east China's Jiangsu Province, Sept. 3, 2019. Copies of the detailed report were donated to the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders and the private Nanjing Anti-Japanese War Museum Tuesday. The report was published in Japan on Aug. 26, 2019. (Xinhua/Li Bo)