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But the war impelled Lui to dream big. At 13, he hit the street, selling his own version of sachima — a traditional Chinese sweet and crispy pastry.

But the United States said the drone, a US Navy RQ-4A Global Hawk, was flying over international waters when it was downed.

By comparison, one drone can spray 200 mu each day. Moreover, precise spraying with drones can also help farmers use 20 percent less pesticides and fertilizer and increase results by 95 percent, he added.

But some were concerned about the rattan basket on the front. Will it stand up to wear and tear?

By 2017, the US, was still tops, spending 9 billion in R&D, and China jumped to the second spot with R&D expenditures of 6 billion, surpassing EU's 0 billion. Together, the US (25 percent) and China (23 percent) accounted for nearly half of the estimated global R&D total in 2017.