My vocabulary is increasing every day.

Atsumu is immersed in compiling a dictionary.

Triumph won the game and was very happy.

My grandfather contracted poliomyelitis when he was young.

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.

It's difficult to handle this machine.

He continued to explain earnestly.

The Edgeworth-Kuiper belt is a collection of icy bodies located on the outer edge of the solar system.

Atsushi is my classmate in junior high school.