"那是我们的高中。"

Translation: That is our high school.

[51jaILDb]

is "That is our high school" really different from "This is our high school" ?

[grippygecko]

Most languages have different words for this and that. You need to learn them.

[Elder-Simmons]

Yes, it is. 那 (na4) is "that" and 这 (zhe4) is "this"