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"Footprints can help paleontologists find detailed information, including the dinosaurs' weight, speed of movement and number," Xing said.

"For example, in big cities, people are willing to spend one month's salary on an iPhone," he said. "In small ones, they prefer mobile phone brands such as Oppo and Vivo, as they have good functions and designs but are relatively cheaper."

"For the economy to fully recover, people will have to be fully confident. And that may have to await the arrival of a vaccine," he said.

"From today going forward, the Federal government will no longer be able to ignore the voice of the majority of the American citizens in Puerto Rico," Rossello said in a statement.

"Growth in China helps to fuel growth here in the United States and that is why it's been very encouraging to see the important steps that China has taken to open up its market to global investors," he said.