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Sentence analysis
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Sentence
Span Details
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
ついに
finally; at last; in the end; after all; never (with negative)-> 遂にadverb
突破口を開いた。
make a breakthrough; break ground-> 突破口を開くexpression, verb