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疫苗与群体免疫：一根针如何救回大家性命
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接种疫苗真有必要吗？没病打针能治病？其实，要疫苗发挥防疫救人功效，还需要实现群体免疫（herd immunity）。BBC给您介绍其过程。
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.
接种疫苗真有必要吗？没病打针能治病？其实，要疫苗发挥防疫救人功效，还需要实现群体免疫（herd immunity）。BBC给您介绍其过程。