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"Curiosity has not determined the source of the organic molecules," said Jen Eigenbrode of NASA's Goddard Space Flight Center who is lead author of one of the two new Science papers.

"Cultural relics are what I know best," says Zhao, who works at Emperor Qinshihuang's Mausoleum Site Museum in Xi'an.

"Currently, our focus is on using underground space for utility, transport, storage and industrial facilities to free up surface land for housing, offices, community uses and greenery, to enhance livability," he said.

"China today is also a major economic power and is open to working with the United States to resolve trade and market access issues, but not through intimidation," he said.

"Como is the silk center of Italy and Europe and has witnessed centuries of Sino-Italy cooperation and communication along the ancient Silk Road," said Yangpu district's governor Xie Jiangang. "We believe both countries will have a closer cooperation under the Belt and Road Initiative."