你的口罩严不严实？有效吗？怎样自造无边缝口罩？
Does your surgical mask or DIY face mask have gaps on the sides? Ignoring this question is unsafe and you risk your own health.
你的口罩严不严实？有效吗？怎样自造无边缝口罩？
Does your surgical mask or DIY face mask have gaps on the sides? Ignoring this question is unsafe and you risk your own health.
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