A leading White House coronavirus expert warned on Sunday that the rising number of cases in the US was making it harder to determine how people were contracting the virus, intensifying concern over people attending large events around the country.
白宮一名領先的冠狀病毒專家週日警告稱，美國的新冠病例越來越多，加大了確定感染方式的難度，此言加劇了人們對於參加全美各地大型活動的擔憂。
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