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"Despite trade barriers that frustrate full market access, US exports to China continue to contribute to US economic growth," said John Frisbie, president of USCBC, which represents more than 200 US companies doing business in China.

"During this process, technology is an important part of business－epitomized by the fact that 70 percent of customer service is provided by artificial intelligence," said Liu.

"Existential debates about ‘global governance' aren't his thing," he said.

"Don't leave home without wearing a mask." An old woman in Caofangzi who went out without a mask was intercepted by a drone. She stared at the drone for several seconds and went back home obediently.

"Despite this 'D614G' mutation to the spike protein, we confirmed through experiments and modelling that vaccine candidates are still effective.