Analyzer
Sentence analysis
8Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
理論
theorynoun
を
object markergrammar
裏付ける
support; back up; substantiate; corroborateichidan verb
データ
data; datumnoun
が
subject markergrammar
必要
necessary; needed; essential; necessity; need; requirementna-adjective, noun
だ。
plain copulagrammar