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"Flight tickets have low marginal costs. By livestreaming communications, it is easy to target the demand of passengers accurately and sell tickets with small profits and large volumes," Lin said.

"From the very beginning, Shenzhen's reform and opening-up has been endowed with the feature of boldly looking for breakthroughs from existing experiences, which is also the starting point of China's great success," said Tao Yitao, director of the China Center for Special Economic Zone Research at Shenzhen University.

"Five years after the first Global Teacher Status Index in 2013, we can see, once again, China has come top, demonstrating just how much respect the Chinese public has for teachers," said Vikas Pota, chairman of the Varkey Foundation. "This is crucial because, as the Global Teacher Status Index 2018 shows for the very first time, there is a direct link between teacher status and pupil performance as measured by PISA."

"Fuel cells are a mainstream (new energy) technology internationally, and the commercial application of fuel cells has already begun in China," said Hu.

"For an international trade city like Shenzhen, its shutdown for one day would have a huge impact on some international industries," said Li Chengjun, an employee in a high technology company in the city.