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疫苗與群體免疫：一根針如何救回大家性命
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接種疫苗真有必要嗎？沒病打針能治病？其實，要疫苗發揮防疫救人功效，還需要實現群體免疫（herd immunity）。BBC給您介紹其過程。
You’re viewing a text-only version of this website that uses less data. View the main version of the website including all images and videos.
接種疫苗真有必要嗎？沒病打針能治病？其實，要疫苗發揮防疫救人功效，還需要實現群體免疫（herd immunity）。BBC給您介紹其過程。