Nurses Wang Rui (L) and Shi Miao arrange patients' test samples at Beijing Ditan Hospital in Beijing, capital of China, May 11, 2020. Beijing Ditan Hospital is one of the capital's designated hospitals for treating COVID-19 patients. Medical workers here have long been working on the front line of fighting against the virus. They were pictured by Xinhua photographer on Monday, a day ahead of the International Nurses Day celebrated on May 12 every year. (Xinhua/Peng Ziyang)