He is an expert in ring theory and has written many papers in the field.

I learned the theory of commutative rings at university.

He was diagnosed with liver cancer.

My grandmother has been suffering from arthritis for many years.

He likes to read picaresque novels.

Dried ginger rhizome is said to be good for preventing colds and maintaining gastrointestinal health.

I learned about casein in biochemistry class.

This shape is called a gyrobifastigium.

This shape is called a gyrobifastigium.

He is playing the character of Bun.