核酸篩查非萬能！北京疫情1個月仍難社會面清零

<img src="https://static.rti.org.tw/assets/thumbnails/2022/05/16/20220516000185M.jpg" width="360" alt="北京以頻繁核酸檢測來防控疫情擴大。圖為15日北京一處核酸檢測點，民眾正排隊等待檢測。...