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你的口罩严不严实?有效吗?怎样自造无边缝口罩?

(2020-04-08 10:22:44) 下一个

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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