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Sentence
Span Details
戦時中、
during the war; wartimenoun, adverb
松根油
pine oilnoun
は
topic markergrammar
航空機
aircraftnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
燃料
fuelnoun
として
as; in the role ofgrammar
研究
research; study; investigationnoun, suru verb
され
passive, potential, or respect auxiliary-> されるgrammar
た。
past tense or completed actiongrammar