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並前往https://www.houstonmethodist.org/blog/articles/2020/dec/herd-immunity-how-many-people-need-to-get-the-covid-19-vaccine/

Herd Immunity: How Many People Need to Get the COVID-19 ...

"Herd immunity is when a large enough portion of a community is immune to a virus so that the virus can no longer spread easily from person to ...

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