These Allergen Masks Can Filter Out Pollen As Small As One Micron

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These Allergen Masks Can Filter Out Pollen As Small As One Micron

"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.

3M™ Filtrete™ Allergen Defense Micro Allergen Filter, MPR 1000, 20 x 20 ...

Breathe Easier with the Filtrete Micro Allergen Reduction Filter ...