I bought cabbage at the supermarket.

This rain, like merciful rain in a drought, really helped the farmers.

This region had been suffering from a long drought, but finally, the merciful rain in a drought fell.

I learned the theory of commutative rings at university.

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

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.