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Sentence analysis
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Sentence
Span Details
核分裂
nuclear fission; karyokinesis; nuclear divisionnoun
を
object markergrammar
維持
maintenance; preservation; keeping upnoun, suru verb
する
light/support verb with a noun or noun-like phrasegrammar
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
臨界量
critical massnoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar