The theory of Banach spaces plays an important role in many fields of mathematics.

He is excited about living in outer space.

He is majoring in aerospace engineering.

His words are always sweet on the surface but venomous underneath.

He said his uvula was swollen and it was hard for him to drink.

He likes to talk about 'pokochin'.

His name is a proper noun, known all over the world.

Esperanto is one of the most well-known international auxiliary languages.

This is my new main topic.

This ramen is a bowlful, I'm worried if I can finish it.