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.
白宫一名领先的冠状病毒专家周日警告称，美国的新冠病例越来越多，加大了确定感染方式的难度，此言加剧了人们对于参加全美各地大型活动的担忧。
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