"Ours" is the possessive form of the pronoun "we." It refers to something that belongs to or is associated with the speakers.
For example:
This is our home. (这是我们的家)
Our team won the championship. (我们的团队赢得了冠军)
The use of "ours" as a possessive pronoun dates back to the Old Engpsh language. In Middle Engpsh, the possessive form of "we" was "oures." Over time, it evolved into the modern spelpng of "ours."