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"EHang is working with the FAA to secure approval for a passenger trial flight of the EHang 216 in the near future," said Hu Huazhi, founder and chairman of Ehang.

"Different feelings push people into different states, which will affect what they see, hear and think, and eventually these feelings are shown in their paintings in terms of color and drawing strength," Jia said.

"E-commerce has no time limit for conducting business online. Anyone, regardless of age or gender, can access the online market via the internet," he said.

"Every day we receive thousands of phone calls, sometime as many as 10,000 a day, a growth of 6.1 times year-on-year from local residents, voicing their complaints or giving suggestions to help solve specific problems in urban management, such as solutions to traffic jams, environmental protection and garbage disposal," said Wu Qiuyun, deputy secretary-general of Haikou, which is the island province's capital city. The city started to build its smart city management platform with the hotline number 12345 in 2017. The platform, which also is a digital center, integrates all information and data from government departments, such as real time traffic conditions and the location of potential safety hazards at construction sites or gas stations. All the data are visualized with real time videos.

"Etiquettes of ancient China, for example, are still relevant in modern society," he says.