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"First firing of Starship Raptor flight engine! So proud of great work by @SpaceX team," founder and CEO of SpaceX Elon Musk tweeted late Sunday night.

"Given the lingering uncertainty over trade tensions, geopolitical issues and the lack of agreement on how to deal with climate change, the drop in confidence in economic growth is not surprising," said Bob Moritz, chairman of the PwC Network.

"Governments used to rely on whistleblowers for clues, but with the help of big data they can take the initiative on more cases," he said.

"For example, in terms of division of responsibilities between operators in China and those in Europe: who should organize the tourists, who should carry them... We would like the rules to be clearer."

"For our part, in order to loan our cultural relics, we have repeatedly negotiated with the British side," Wu said. "Especially in insurance and safe transportation, we have made a lot of safety requirements to carry out the exhibition smoothly."