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system / series / lineage / family
He is a carnivorous man, being aggressive in relationships.
Kyūjitai form of 生態学 (“ecology”)
He is very interested in ecology.
ecology
He is an expert in ecology.
oceanography
He is an expert in oceanography.
Kyūjitai form of 海洋学: oceanography
My major is oceanography.
marine pollution
Marine pollution is a global issue, and all countries should cooperate to find a solution.
Kyūjitai form of 古生態学: paleoecology
He is an expert in paleoecology, pouring his passion into studying past ecosystems.
paleoecology
Paleoecology is a field of study that investigates the relationship between past organisms and their environment.
marine biology
I am very interested in marine biology.
an immune system
Because her immune system is weak, she catches a cold easily.
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