A resident receives medical checkup before donating blood on a blood donation vehicle in Lianyungang, east China's Jiangsu Province, June 14, 2020. A number of residents donated blood on Sunday, the World Blood Donor Day. (Photos: Xinhua)

A resident donates blood at a blood donation point in Nanjing, east China's Jiangsu Province, June 14, 2020. A number of residents donated blood on Sunday, the World Blood Donor Day.

A medical staff records information of a resident at a blood donation point in Zigui County, central China's Hubei Province, June 14, 2020. A number of residents donated blood on Sunday, the World Blood Donor Day.

A resident donates blood on a blood donation vehicle in Zaozhuang, east China's Shandong Province, June 14, 2020. A number of residents donated blood on Sunday, the World Blood Donor Day.

A resident donates blood on a blood donation vehicle in Wanzai County of Yichun, east China's Jiangxi Province, June 14, 2020. A number of residents donated blood on Sunday, the World Blood Donor Day.