Giant panda "Yuan Yuan" plays at the Qinling research center of giant panda breeding in northwest China's Shaanxi Province on March 31, 2020. In 2019, three giant panda cubs "Jia Jia", "Yuan Yuan" and "Qin Kuer" were born in the Qinling research center of giant panda breeding. The three giant pandas grew up healthily with the care of the staff.

Medical workers attend a welcome ceremony at Xi'an Xianyang International Airport in northwest China's Shaanxi Province, March 31, 2020. A batch of 267 medical workers returned to Shaanxi on Tuesday after aiding the fight against the COVID-19 in central China's Hubei Province.

Photo taken on March 31, 2020 shows migrant birds at the Wolong Lake wetland in Kangping County of Shenyang, capital of northeast China's Liaoning Province.

Aerial photo taken on March 26, 2020 shows a concrete stirring station at the Xiongan New Area, north China's Hebei Province.

Medical workers board the train at Wuhan Railway Station in Wuhan, central China's Hubei Province, March 30, 2020. A total of 132 medical workers from the Third Xiangya Hospital of Central South University in Hunan left Wuhan on Monday after finishing their task.

Farmers water the wheat in the fields at Dongjiazhuang Village of Pingyi County in Linyi City, east China's Shandong Province, March 30, 2020.