AnalyzerSentence analysis6SpansSentence石油は主要なエネルギー源です。1000 character limitAnalyzeSentence石せき油ゆは主しゅ要ようなエネルギー源げんです。Span Details石せき油ゆoil; petroleum; kerosene; paraffinnounはtopic markergrammar主しゅ要ようmain; principal; major; chiefna-adjective, nounなadnominal form of the copula after a na-adjectivegrammarエネルギー源げんenergy sourcenounです。be; is; arecopula, auxiliary出洲ですspit of land; sandspit