Zhang Jingxian is seen at the Zhanghezhuang martyrs cemetery in the economic development zone of Heze City, east China's Shandong Province, March 20, 2019. For 11 years, Zhang Jingxian, a veteran, has posted over 1,000 letters to help martyrs, who sacrificed in a battle occurring in Heze in 1947 and were buried here, find their families. So far, he has got family addresses for 30 martyrs. A collection of heartwarming moments in 2019 by Xinhua photographers. (Xinhua/Wang Kai)