That person is my friend.

He is not only an excellent doctor, but also a wonderful educator.

He is knowledgeable about human affairs.

Choosing a leader for the new project is very important.

In medical classes, we learn about the structure of the human body.

He is suffering from inflammation of the renal pelvis.

Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

He is a world-renowned agronomist.

I am majoring in social science at university.

He is a world-famous scientist.