What exactly is the melt-blown fabric in the masks we are using now? Just cut open the mask and take a closer look, and you will find that the interior of a medical surgical mask is actually ingeniously composed of three layers of structure, which is usua
10-Sep--2025
Grandpa Zhang has the habit of morning exercise, but whenever there is smog, he gets worried. Every time I come back from going out, my throat is dry, itchy and uncomfortable, and I keep coughing. It feels as if my throat is covered with a layer of dust.
08-Sep--2025
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