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Span Details
光学繊維
optical fibernoun
は
topic markergrammar
高速通信
high-speed communicationnoun
に
direction, time, indirect object, or target markergrammar
不可欠
indispensable; essential; vitalna-adjective, noun
な
adnominal form of the copula after a na-adjectivegrammar
技術
technology; engineering; technique; skill; art; craftnoun
です。
be; is; arecopula, auxiliary
出洲ですspit of land; sandspit