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Biden and Bloomberg are trying to present themselves as the party's best choice to take on Trump, saying Sanders is too far to the left to win the general election.

Belt and Road initiative enriches Spain-China cooperation. [Photo/VCG]

Besides Vivo, the list of Chinese sponsors for the World Cup includes property-entertainment conglomerate Wanda, home appliance maker Hisense and dairy producer Mengniu, with established brands and lower-profile yet equally ambitious companies on board.

Belgium boasts many top universities in Europe, and has unique cutting-edge technologies in the fields of microelectronics, biomedicine, energy conservation and environmental protection, and modern agriculture. Thousands of Chinese students come to the country for education or exchanges each year.

Biden is likely to face questions in the debate for saying he had a cordial working relationship with two Democratic Southern segregationists in the Senate. He's also likely to be questioned about his strong opposition — before reversing his stance — to federal funding for abortion, analysts said.