These Shocking Bursitis Ankle Images Reveal Why It's So Painful
"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.
What Causes Foot and Ankle Bursitis? - Foot & Ankle Centers of Frisco ...
