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"CDC guidelines are still recommended but not required, and the president is the most tested man in America," she said, referring to the Centers for Disease Control and Prevention. "It's his decision whether to wear a mask."

"China is the most exciting and dynamic market in the world. The continuous growth in its economy and middle class sustains the country's upward aviation market," said Randy Tinseth, vice president of commercial marketing for Boeing. "As China has the world's fastest growing e-commerce industry, demand for air-cargo freighters is also expected to expand exponentially."

"China is a potential market. We would like to take the opportunity to export as many generic drugs to China as possible," said Prashant Lokhande, business and economic counselor at the Indian embassy in Beijing.

"China has switched from pursuing high-speed growth to aiming for high-quality growth, and local economic performance evaluation systems should be adjusted to better support China in achieving the new goals," Ning said.

"By then, the whole railway will become a boutique tourist route linking Zhangjiajie, Fenghuang and Guilin, all top scenic spots in China," he said.