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Dulong ethnic minority group in Dulongjiang township, Gongshan county, Yunnan province

Drones taking part in the speed competition had to fly through all kinds of obstacles within a prescribed flight path.

Dr Anthony Fauci, director of the National Institute of Infectious Diseases, said stay-at-home orders and social distancing may be paying off, as the rate of increase in new infections appears to be declining.

Dujarric said the secretary-general was sending a letter Thursday to member states explaining that "a three-phase response activation system to manage and coordinate health emergencies is in place and that UN headquarters in New York is currently in phase two, which is an active risk reduction mode."

Dong Dengxin, director of the Finance and Securities Institute at the Wuhan University of Science and Technology, expects that both the detailed rules and the list of the first companies involved are likely to come out in March.