按下面CDC研究,这2000个学生回家后把病毒传染给家人的比率很高
回答: https://www.covidschooltracker.com/? 纽约的同学们看一看,K-12到现在已经有快2000例
由 XiaoDuiRenSheng
于 2020-10-12 09:25:30
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