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Participants pose for a group photo in front of John Rabe's tomb at Kaiser Wilhelm Memorial Cemetery in the western suburb of Berlin, Germany, on Jan. 5, 2020. At a corner of a cemetery in the west of Berlin stood the tombstone of John Rabe, an ordinary German businessman who became revered and remembered by Chinese, for he helped protect Chinese citizens during the 1937 Nanjing Massacre. (Xinhua/Ren Ke)