I used an optical microscope for an experiment at school.

Cell biology is the study of the structure and function of cells, which are the basic units of life.

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

Neuroanatomy is an important field of study for understanding the structure and function of the brain.

Demography is an important tool for understanding various aspects of society.

I studied linear algebra at university.

Humanities is an academic field that studies human culture and society.

He is world-famous as a comparative linguist.

Listening to music is really enjoyable.

His army had a great array of spears and chariots like '輵'.