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Medical workers who finished their daily work pose for a photo before leaving a mobile laboratory for nucleic acid test in Harbin, northeast China's Heilongjiang Province, November 5, 2021. A mobile, inflatable laboratory for conducting COVID-19 tests was officially put into use on Nov. 1 at a sports center in Harbin. The laboratory can cope with swab samples from 1.75 million people for nucleic acid tests per day. (Photo by Xinhua News Agency/Rex Features/Shutterstock)
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