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natural history
He has a deep interest in natural history.
veterinary medicine
He is majoring in veterinary medicine.
gerontology
He is known as an expert in gerontology.
petrology
He is an expert in petrology and is in charge of geology lectures.
soil science
He is majoring in soil science at university.
logic (method of human thought)
He is majoring in logic at university.
crystallography
He is an expert in crystallography.
(semiotics) semiology
Semiotics is the study of signs and symbols used in society and culture.
toxicology
He is an expert in toxicology.
(sociolinguistics) dialectology
He is an expert in dialectology, studying dialects from all over Japan.
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