People release white doves during the unveiling ceremony of the Nanjing Massacre Victims Monument at the Elgin Mills Cemetery in Richmond Hill, Ontario, Canada, Dec. 9, 2018. In order to remember the history of World War II and to maintain a lasting peace in the world, peace-loving people officially launched the Nanjing Massacre Victims Monument in Ontario, Canada on Sunday. (Xinhua/Zou Zheng)