This grammar rule is using the exclusive form.

Exclusive form of grammar is used to refer to a specific object only.

This train will stop at the next station.

The bus arrived at the station to stop.

This is the last chance.

Once you tell a lie, you lose trust.

He is studying Japanese.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

This butterfly valve is used to control the flow of fluid.

He explained in detail about the structure of the sphenoid bone.