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paleozoology
He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.
Kyūjitai form of 古動物学 (“paleozoology”)
He has a deep interest in paleozoology.
electronics
He is an expert in electronics.
fiber optics (US), fibre optics (UK)
My specialty is fiber optics.
engineering
He is majoring in engineering.
電子工学: electronics / 電子光学: electron optics
I am majoring in electronics at university.
demography
Demography is a part of social science that studies the structure, evolution, and problems of human population.
engineering department of a school
My younger brother will enter the engineering department next year.
Kyūjitai form of 人口学: demography
Demography is a branch of social science that studies the structure, distribution, and changes in human population.
He is an expert in fiber optics.
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