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"Every year we discover footprints that belong to different categories of dinosaurs. The first year were theropods, the second year pterosaurs, the third year sauropods and the fourth year ornithopods," Jin said.

"Cybersecurity is the top challenge for the industrial internet, which is entering a fast lane in China, and more efforts are needed to better solve the problem," Qi said.

"Emergencies may be more frequent when many travelers take trains home at the same time, looking forward to family reunions after working the whole year," said Yang, adding that travelers who haven't bought tickets or miss their train are common during the travel rush.

"Except for one person from Wuhan, Hubei province, all the other employees returned to their workplaces," said He Zhi, technology director at Foshan Tiandixing Technology Co, a high-tech company specializing in internet technology for vehicles.

"During cooperation with Africa, the international community should respect the sovereignty of Africa, listen to Africa's opinions, value Africa's proposals and live up to their promises," he said.