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Sentence analysis
8Spans
Sentence
Span Details
水素化
hydrogenationnoun, suru verb
反応
reaction; response; physical response; physiological reaction; chemical reactionnoun, suru verb
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
触媒
catalystnoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar