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A worker transports a package of China's Sinovac COVID-19 vaccine at the Phnom Penh International Airport in Phnom Penh, Cambodia, on June 28, 2021. A new batch of COVID-19 vaccine Cambodia purchased from China's pharmaceutical company Sinovac Biotech arrived in Phnom Penh, capital of Cambodia, on Monday, the state-run National Television of Cambodia (TVK) reported. (Photo by Sovannara/Xinhua)