A Japanese woman (R) attends a memorial ceremony in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Han Yuqing)

Xia Shuqin, a survivor of the Nanjing Massacre in 1937, mourns her family members in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Han Yuqing)

Survivors and family members of the victims of the Nanjing Massacre in 1937 mourn for the deceased during a memorial ceremony in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Han Yuqing)

Yang Cuiying (front), a survivor of the Nanjing Massacre in 1937, mourns her family members in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Sun Can)

Lu Hongcai (R), a survivor of the Nanjing Massacre in 1937, mourns the victims in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Han Yuqing)

Survivors and family members of the victims of the Nanjing Massacre in 1937 mourn for the deceased during a memorial ceremony in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Han Yuqing)

Survivors and family members of the victims of the Nanjing Massacre in 1937 attend a memorial ceremony in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Sun Can)

Xia Shuqin, a survivor of the Nanjing Massacre in 1937, mourns her family members in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Sun Can)

People attend a memorial ceremony in the Memorial Hall of the Victims in Nanjing Massacre by Japanese Invaders, in Nanjing, capital of east China's Jiangsu Province, April 5, 2014, also the Qingming Festival, or the Tomb-Sweeping Day. Lots of citizens came here to mourn Nanjing Massacre victims on Saturday. (Xinhua/Sun Can)