A medical student from Shenzhen University presents flower to the Tree of Brightness, planted in commemoration of cornea donors, during a memorial event for body and organ donors held by Shenzhen's Municipal Red Cross Society at Jitian Cemetery in Shenzhen, south China's Guangdong Province, April 5, 2018, on the occasion of the Qingming Festival. (Xinhua/Mao Siqian)