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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.

"China's Anti-Domestic Violence Law has made people understand that beating children is against the law, which is the positive effect of legislation."

"China's experience so far shows that a full economic recovery will take time," Tilton said in an interview with CNBC on May 4.

"Compared to the tests on closed tracks and under the supervision of a backup driver, the driverless road tests on public streets will examine various capabilities of autonomous driving system, especially how the self-driving vehicles deal with emergencies," Jiang said.

"Ctrip launched its offline development strategy in 2017, and so far our offline business is well-received just as our online services," said Peng Liang, analyst at Ctrip's vacation business unit.