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At the Democratic debate in Miami on Thursday, Harris, a black US senator from California, tore into Biden for opposing mandatory school busing in the 1970s and for his cooperation with segregationists while he was a young senator.

At the "Smart Nanjing" center, run by the Nanjing Municipal Commission of Economy and Information Technology, Li spoke highly of the center using internet-based technologies to get government approvals done online, calling it a highlight for administrative streamlining.

At that time, nothing could be harvested due to frequent sandstorms, and houses and fields could be buried overnight.

At the same time, the renminbi exchange rate is flowing up and down more flexibly.

At that special summit, President Xi Jinping called on G20 members to enhance international macroeconomic policy coordination to address the negative impacts and prevent the world economy from falling into a recession.