This grammar rule is using the exclusive form.

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

He inherited the company from his father.

In this story, all of Tan's actions are absurd and incomprehensible.

He is looking for someone who will accept him for exactly what he is.

He has a very warm heart.

I am majoring in biophysics at university.

I am majoring in physical chemistry at university.

This filter helps to improve the sound quality.

This coastline is protected by wave-dissipating blocks.