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"China welcomes the US side to participate in cooperation within the framework of the Belt and Road Initiative," said Xi.

"China's economy has gradually emerged from the slump and returned to the level it was roughly at prior to the outbreak, backed by the stimulation that has delivered burgeoning signs of work resumption, industrial chains and services sector," said Shao Yu, chief economist at Orient Securities.

"Chinese infrastructure investments can have a big impact in the fields of renewable energy, establishment of economic zones, manufacturing, telecommunications and digital commerce," Pitlo said.

"Cooperation is vitally important for solving all of the challenges the world has faced in the global ecological environment," said Laurent Fabius, chairman of the United Nations Climate Change Conference in Paris, who was invited to the conference.

"Chinese is really hard to learn," he says.