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"Guidance needs to change and needs to be clear that these nonmedical, nonsurgical masks are beneficial to the general public and should be worn when outside of the home," Robert Hecht, a professor of epidemiology at the Yale University School of Public Health, said in an article published Monday on politico.com.

"Further studies into microbial pathogens such as bacteria and viruses and immunological antibodies are urgently required, to help validate saliva for future routine specimen collections, in this and future pandemics," Han said.

"Hangzhou is unique, because it gave me enlightenment on Chinese calligraphy," De Laurentis said.

"Geely will step up efforts to make AI-enabled, internet-connected smart cars. Such cars will become more intelligent where mobile terminals can be connected to the network and drivers can talk to the system in the car," said Shen Ziyu, vice-president of the Geely Automobile Research Institute.

"For a Fujian-based tech company, President Xi's speech is inspiring. We will leverage more technologies into the global education market and beef up our global presence to help improve the country's strength in cyberspace."