the one(s) belonging to or connected with the person who is speaking and one or more other people

Which table is ours? 哪张桌子是我们的？

He's a cousin of ours. 他是我们的一个表兄。

Ours is the red car parked over there. 我们的车是停在那边那辆红色的。

Ours is a huge country. 我们的国家是个大国。