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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.
oenology
He is an expert in oenology and has a deep knowledge of wines from around the world.
humanities
He is majoring in humanities at university.
study of history
He is majoring in history at university.
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