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Sentence analysis
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Sentence
Span Details
苦節
unremitting effort; dogged perseverance; unswerving loyaltynoun
を
object markergrammar
重ねて
once more; repeatedly; againadverb
研究
research; study; investigationnoun, suru verb
を
object markergrammar
続け
continue; keep doing; keep up; continue to ...; keep on ...-> 続けるichidan verb, auxiliary
た。
past tense or completed actiongrammar