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"Emissions from steel enterprises has a marked effect on air quality. None of the top 20 cities for steel output - which are responsible for 51 percent of the country' total capacity - has air quality that meets the national standard. The average density of tiny PM2.5 particulate matter in these cities is 28 percent higher than the national average," said He, who is also an academician of the Chinese Academy of Engineering.

"Dynamic economies can promote the flow of people and goods. If someone tries to impede the flow, he is blocking the development of economies and society, which is against the historical trend and objective laws," he said.

"Despite the recent confirmed cases, USFK remains at a high level of readiness with less than 1 percent of its active-duty service members currently confirmed positive with COVID-19," the USFK said.

"Favorable development of tourism always connects with culture, so it is no accident that esports and tourism complement each other," said Zhou Lin, a travel researcher with the Heilongjiang Academy of Social Sciences. "As an emerging cultural format, esports games have been widely accepted by young people who are the main force of cultural communication and tourism consumption."

"Every reputable health institution says wearing a mask is one of the most effective things people can do to protect others from contracting COVID-19, especially in places like an aircraft, where social distancing is a challenge," Toby Enqvist, United's chief customer officer, said in a statement.