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David Sheriff, managing director of Nova Tour, the buyer of the 500th bus, said: "Yutong has left a very good impression on its UK users. It's cost-effective and our drivers indicated that the driving experience is also fabulous."

David Hui Shu-cheong, an infectious disease expert at the Chinese University of Hong Kong, said on a radio program that he hopes at least five million people can sign up for the tests, so that silent carriers can be traced and local transmission chains cut off.

Dai Juan, general manager of SenseTime's education department, said AI has played an active part in fighting the epidemic, including using big data to control the outbreak as well as facilitating disease screening and diagnosis, which shows that AI has become a new kind of productivity for social development.

Dec 8 - Pfizer Inc cleared the next hurdle in the race to get its COVID-19 vaccine approved for emergency use on Tuesday after the U.S. Food and Drug Administration (FDA) released documents that raised no new issues about its safety or efficacy.

DPRK Vice-Foreign Minister Han Song-ryol told the Associated Press in Pyongyang on Friday, "We will go to war" if the US chooses to provoke it.