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"Continued foreign and domestic investment in infrastructure development, such as roads and urban expansion, will be key for sustained economic growth in Africa and the Middle East over the next decade," said Zhao Ying, a researcher at the Institute of Industrial Economics of the Chinese Academy of Social Sciences in Beijing.

"Considering that the two accidents took place after new Boeing 737 MAX 8s were delivered, and went down just minutes after taking off, within five months of each other, they have some degree of similarity," the administration said in its statement. The administration grounded all Chinese Boeing 737 MAX 8 jets on March 11.

"Customized supplies of coal and thinking ahead of customers to provide them what they really need will be key for coal mines to develop," he said.

"China's demand just isn't big enough to absorb Brazilian and American crops in six months unless the Chinese are willing to purchase extra supplies and put them in storage,'' he told China Daily. "Otherwise, we won't work through the current large stocks in a snap of a finger. Long term, things may be better. The devil is in the details.''

"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.