These Pictures Of Respirators Show A Surprising Seal

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These Pictures Of Respirators Show A Surprising Seal

"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.

Happy Birthday Seal Seal Henry Olusegun Olumide Adeola Samuel, better ...

safety - How exactly do respirators seal out pathogens? - Engineering ...