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A worker transfers packages of China's Sinopharm COVID-19 vaccine at the Phnom Penh International Airport in Phnom Penh, Cambodia, Aug. 1, 2021. A plane carrying a new batch of China-donated Sinopharm COVID-19 vaccine touched down in Phnom Penh, capital of Cambodia, on Sunday, Cambodian Prime Minister Samdech Techo Hun Sen said. (Photo by Phearum/Xinhua)