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Sentence analysis
11Spans
Sentence
Span Details
理論
theorynoun
の
possession, attribution, nominalizer, or nominal linkergrammar
構築
construction; building; erection; creation; formulation; system architecturenoun, suru verb
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
長年
many years; a long timenoun, adverb
の
possession, attribution, nominalizer, or nominal linkergrammar
研究
research; study; investigationnoun, suru verb
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar