People strike the Bell of Peace at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, east China's Jiangsu Province, Aug. 15, 2019. Activities were held Thursday in Nanjing to commemorate the 74th anniversary of Japan's unconditional surrender in World War II. (Xinhua/Ji Chunpeng)

A flag-raising ceremony is held at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, east China's Jiangsu Province, Aug. 15, 2019. Activities were held Thursday in Nanjing to commemorate the 74th anniversary of Japan's unconditional surrender in World War II. (Xinhua/Ji Chunpeng)

A flag-raising ceremony is held at the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, east China's Jiangsu Province, Aug. 15, 2019. Activities were held Thursday in Nanjing to commemorate the 74th anniversary of Japan's unconditional surrender in World War II. (Xinhua/Ji Chunpeng)

A woman visits the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders in Nanjing, east China's Jiangsu Province, Aug. 15, 2019. Activities were held Thursday in Nanjing to commemorate the 74th anniversary of Japan's unconditional surrender in World War II. (Xinhua/Ji Chunpeng)