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A staff member works at a nucleic acid testing site in Sydney, Australia, Aug. 4, 2021. As of Tuesday afternoon, there had been 34,833 confirmed cases of COVID-19 in Australia, and the number of locally acquired cases in the previous 24 hours was 219, according to the latest figures from the Department of Health. Recently, the country's most populous city of Sydney in the state of New South Wales (NSW), continued to battle the outbreak of COVID-19 triggered by the Delta variant. (Xinhua/Bai Xuefei)