Chang Xiaomei (C), daughter of a Nanjing Massacre survivor, shares her father's story at a testimony meeting to mark the 81st anniversary of Nanjing Massacre in Tokyo, Japan, Dec. 12, 2018. A series of commemorative activities have been held by Japanese civil groups recently in various cities to mark the 81st anniversary of Nanjing Massacre. (Xinhua/Du Xiaoyi)