The meaning of "only one":

Existence and uniqueness mean "existence and uniqueness". "You" means "You" and "Only" means "Unique". In mathematics, there is only "?" Representation, that is, unique quantifier representation, belongs to logical symbols. It means that there is exactly one, only one that meets the requirements and is the only quantifier.

"Only one" sentence:

Among the students in our class, only Xiao Wang is party member.

He is the only one in the whole company who won the year-end award.

There is only one student skipping rope on the playground.

At this time, there is only one person in the company.

5. You own, own, and there is only one person in this world, which is perfect.