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憲法改正
constitutional reform; constitutional amendmentnoun
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
国民投票
national referendum; plebiscitenoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
です。
be; is; arecopula, auxiliary
出洲ですspit of land; sandspit