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Before the fair, participants gave PowerPoint presentations to a panel of judges, who then attended the fair as visitors to interact with the students. Shoppers at the China World Mall were also invited to attend the fair as ordinary consumers.

Because its external security environment is complex, China faces serious challenges in safeguarding its national sovereignty, territorial integrity, maritime rights and other interests, it said.

Beijing's students and teachers who have been back to campus will wear an intelligent device resembling a sports bracelet that can monitor their body temperatures and alert an app if someone has a fever as part of the capital's latest pandemic control and prevention efforts using technology.

Beijing's education department has ordered tighter management of preschools, especially in improving moral codes of conduct applied to teachers. Three Chaoyang education officers have been investigated for weak supervision of private kindergartens, according to Beijing police.

Because of those challenges, a government statement said, the highway port would be closed from Tuesday until April 13.