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Sentence
Span Details
マイクロフィルム
microfilmnoun
技術
technology; engineering; technique; skill; art; craftnoun
は
topic markergrammar
文書
document; writing; papers; document addressed to someone (historical)noun
保存
preservation; conservation; storage; maintenance; saving (data)noun, suru verb
に
direction, time, indirect object, or target markergrammar
役立つ。
be useful; be helpful; serve the purposegodan verb