How These 3m 60921 Organic Vapor Cartridges Filter Out Toxic Fumes

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How These 3m 60921 Organic Vapor Cartridges Filter Out Toxic Fumes

"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™ Organic Vapor Cartridge/Filter 60921, P100

3M™ Organic Vapor Cartridge/Filter 60921, P100 (Set of 2) - Accurate ...