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Students pay tribute to martyrs at Yuhuatai memorial park of martyrs in Nanjing, east China's Jiangsu Province, April 4, 2019, the eve of the Qingming Festival. It is a tradition for the Chinese people to pay respect to ancestors, deceased family members, and national heroes and martyrs at the Qingming Festival, a day for tomb sweeping. (Xinhua/Su Yang)
