你的口罩有效嗎？免費家裏測量質量識別假貨，千萬不要亂用自己騙自己

你的口罩有效嗎？免費家裏測量質量識別假貨，千萬不要亂用自己騙自己

Is your face mask effective? How do you test the quality of your mask, especially your own DIY masks? Avoiding this question is unsafe and you cheat your own health.

more details can be found here

youtube