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'm going to work, see you later.

I ran into an old friend by chance at the library.

I carry my lunch box every day.

I can't stand it anymore, get out!