关键你要分开那个是自然变化,那个是疫苗作用。
回答: 正确说法是-疫苗起作用需要一个过程。如果新病例趋势是上升,这过程本身不能阻止这个趋势。需要隔离和social distancin
由 huntridge
于 2021-05-04 14:28:27
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