關鍵你要分開那個是自然變化,那個是疫苗作用。
回答: 正確說法是-疫苗起作用需要一個過程。如果新病例趨勢是上升,這過程本身不能阻止這個趨勢。需要隔離和social distancin
由 huntridge
於 2021-05-04 14:28:27
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