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.

He is researching on the pathogenesis and treatment of early-onset diabetes.

This area is rich in bedded cupriferous iron sulphide deposits.

Like this, we deepened our friendship.

The doctor diagnosed a problem with his anus.