忘记口罩或没有口罩，怎么办？简易门前10秒钟自制口罩，不用剪刀高质量。

A long sleeve shirt is pretty easy, but what if you only have a T-shirt? Worse, even if you don't have a T-shirt, I will show you how to use any fabric you have with you.

more details can be found here

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