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"China has been promoting tobacco control in public areas for a long time. A national ban with legal force has been considered, but not launched," Yang said. "Research like this can serve as evidence for policymakers and convince the public of the necessity to strive for an environment free of smoke fumes."

"China is one of the countries with the lowest number of gun crimes and is one of the safest countries in the world," Sun said.

"China offers a lot of unique experiences," she said, adding that making those experiences available to international travelers would help China's tourism sector grow faster.

"China demands that the US keep its promises, rectify its wrongs, refrain from implementing relevant clauses of the bill and stop seeking any official contacts, military ties or arms sales with Taiwan, so as to avoid doing serious harm to the China-US relationship, the ties between the two countries' militaries and the peace and stability across the Taiwan Strait," Wu said.

"Carriers must connect as many small cities as possible to their hub airports to remain competitive. The sustainable growth of regional aviation is the core competitiveness of the Chinese airline industry," said Li Guijin, a professor at the Civil Aviation Management Institute of China in Beijing.