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Biden is often called "Uncle Joe" in the press because of his folksy manner, and some see that jovial demeanor, his White House experience and his ability to relate to blue-collar Americans as among his best assets.

Besides Huawei's program, he said that China has been providing capacity building support to Africa, through various short and long-term training programs in China.

Being the sole breadwinner for the family, Luo Guoquan, the girls' father, said his income was far from enough to pay for the surgery, as a result of doing part-time jobs and taking care of his children at the same time.

Bezos giving a demonstration on stage.

Biden, 77, hopes to boost his faltering campaign by winning key support from African American voters in South Carolina.