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Biden, who previously sought the White House in 1988 and 2008, was to deliver his remarks to a live audience consisting of a few reporters, aides and family in his hometown of Wilmington, Delaware.

Being asked whether robots would make people jobless, Koeckler said humans in the factory will be the core of the production. He believed that robots in the future would be more like a tool and that more people are needed to program robots and to be the guide of robots in the factory.

Besides Hubei, Yunnan and Shandong provinces also have fire rescue dogs, he said.

Besides new energy vehicles, China is also blazing the trail for connected and automated mobility. It is one of the world's largest markets for cloud services, e-commerce and shared services, and this trend is rapidly crossing over into the automotive industry.

Beyond Xi'an, Chinese cities, including top-tier cities like Beijing, Shanghai and Shenzhen and provincial cities in particular, kept expanding and attracted more people along with the country's urbanization. Of course, attendant issues, such as air pollution, traffic jam, housing prices and public resources distribution, sometimes throw big city development into doubt.