今天听到广播说刚刚有篇论文发表。
论文的另一个statement 是:不戴口罩距离六尺的风险高于戴口罩距离三尺。
今天听到广播说刚刚有篇论文发表。
论文的另一个statement 是:不戴口罩距离六尺的风险高于戴口罩距离三尺。
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