He is an expert in paleoecology, pouring his passion into studying past ecosystems.

He is writing a thesis on paleogeography.

He is an expert in pomology and has contributed to the improvement of many fruit varieties.

He is a famous philosopher, influencing many people.

He is a famous osteologist, studying many fossils.

Infrasound is a type of sound that is inaudible to the human ear.

Debuccalization refers to the phenomenon in phonetics where a specific sound is pronounced outside the oral cavity.

Kunminjōon is a book for teaching the correct pronunciation of Hangul.

I am majoring in econometrics at university.

He is known as an expert in palaeoclimatology.