These Nanofiber Face Mask Filters Block More Than We Realized

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These Nanofiber Face Mask Filters Block More Than We Realized

"those / these" are determiners and are used before nouns to refer to a particular group of things / people, e.g. these people / those rules / those buildings. Update: 题主问的是What are those? 然后他.

Full Face Respirator Mask with 4 Filters 2097 - Reusable Large Face ...

What to Use as Filters in a Face Mask | POPSUGAR Fitness