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Beijing resident Wang Zhixing, 46, said the exhibition could not have come at a better time.

Before the talks, Xi held a welcoming ceremony for Kim at the North Hall of the Great Hall of the People.

Before it opened, Cong visited Vietnam seven times in the space of a year to figure out how to make the soup base. "I noticed that every pho restaurant in Vietnam has its own recipe for the soup base, and there is no right or wrong way－just different flavors."

Before the outbreak, business contingency plans were already in place to handle unexpected scenarios, with measures including emergency stocks at distribution centers outside high-risk areas, as well as collaboration with external suppliers.

Beijing has homed in on a series of policies to advance 3D printers. In the past, the Ministry of Industry and Information Technology, the industry regulator, had released the National 3D Printing Industry Development Plan (2015-2016), which established goals for the sector's innovation and commercialization.