A volunteer holds a sign reminding people to keep social distance before the opening ceremony of the 4th China International Import Expo (CIIE) in east China's Shanghai, Nov. 4, 2021. (Xinhua/Jin Liwang)
COVID-19 control and prevention at 4th CIIE
Source: Xinhua| 2021-11-08 22:08:55|Editor: huaxia
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