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https://www.who.int/zh/news-room/questions-and-answers/item/coronavirus-disease-%28covid-19%29-variants-of-sars-cov-2
您即将离开知乎,请注意您的帐号和财产安全。
https://www.who.int/zh/news-room/questions-and-answers/item/coronavirus-disease-%28covid-19%29-variants-of-sars-cov-2