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Parents stand outside a school in Sofia, Bulgaria, Sept. 15, 2021. Despite the severe COVID-19 pandemic in Bulgaria, all the 2,357 schools across the country opened their classrooms for the new school year. (Xinhua/Lin Hao)
Parents stand outside a school in Sofia, Bulgaria, Sept. 15, 2021. Despite the severe COVID-19 pandemic in Bulgaria, all the 2,357 schools across the country opened their classrooms for the new school year. (Xinhua/Lin Hao)