He is majoring in agronomy at university.

Epidemiology is the science that studies the occurrence and spread of diseases.

I am majoring in political science at university.

I am majoring in physiology at university.

He likes going to chamber music concerts.

He is in the third year of junior high school, or in other words, he is in the 9th grade in school years.

He has a deep interest in numismatics.

I am interested in dermatology.

My major is chemical engineering.

He likes to take a walk in the park at dusk.