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洞窟 news2 nf29 spec2 | news2 nf29 spec2 どうくつ
gen. cavern n adj-no; cave n adj-no; cave system n adj-no; grotto n adj-no
洞窟 どうくつ
gen. Cave Geological Terms Dictionary (Bruce Bain and Leslie Oberman)
geogr. Doukutsu
tech. cavern