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"Every single week practically you hear about scientists being dismissed or relocated and key positions not being filled," Ray Weymann, an astrophysicist and a co-organizer of the open letter, was quoted by The Guardian as saying.

"Different universes" are meeting as traditional carmakers find high-tech firms like Google or Alibaba, mobility services firms like Uber and Didi and even telecoms firms racing to set industry-wide standards.

"Donald Trump has waved the white flag, abandoned our families and surrendered to this virus. But the American people never give up, never give in," Biden said, calling Trump's rally a "super-spreader event".

"During the outbreak, this helped save much time in terms of paperwork, and such practice was also in line with international practice," Shao said.

"Dairy producers and governments are carrying out strict and multifarious quality tests on fodder, breeding methods, raw milk and final products," Gao said, adding that consumers' confidence is gradually increasing.