Twenty months into a pandemic that has claimed almost 770,000 American lives and nearly a year after Covid-19 vaccinations became available, US health experts warn a fifth wave of infections risks overwhelming health systems in the worst-affected states.
新冠疫情已持續20個月，導致近77萬美國人死亡，同時新冠疫苗問世已近一年，美國衛生專家警告稱，第五輪疫情可能令受影響最嚴重的州的衛生系統不堪重負。
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