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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.

"From 2010 to the end of May, we've seen more than 3,000 freight train trips," said Xing Fangmin, a staff member at the Jiaozhou Bay International Logistics Harbor in Qingdao. "With a travel distance of about 4,500 kilometers, goods can reach Kazakhstan, Uzbekistan, Kyrgyzstan, Turkmenistan and Tajikistan within two weeks. We call it the Iron Silk Road."

"Getting a cross-provincial business license previously would take at least a day, and I would have had to bring print documents and official seals to Shanghai," Mo said.

"From what we have seen, it would be a feat if it would be a 5 percent drop," said Shi.

"Fortunately, we did not find any final products," Li told a news briefing on Thursday night.