He is an expert in astrophysics, and his research is highly valued around the world.

He is an expert in applied physics.

He is known as a person with learning.

He loves physics and studies it in the library almost every day.

I am majoring in physical chemistry at university.

He is a world-famous physicist.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

He has a deep interest in archaeology.