My major is chemical engineering.

He is interested in geometrical shapes.

That theory is unscientific and has no evidence at all.

I am majoring in parasitology at university.

He is an expert in parasitology and conducts many researches.

He is a world-renowned osteologist.

He is a famous osteologist, studying many fossils.

The war crime was condemned as inhumane by the international community.

I ended up living together with him.

This diesel powered train is running on a diesel engine.