AnalyzerSentence analysis3SpansSentence肝心な部分1000 character limitAnalyzeSentence肝かん心じんな部ぶ分ぶんSpan Details肝かん心じんessential; crucial; vital; keyna-adjective, nounなadnominal form of the copula after a na-adjectivegrammar部ぶ分ぶんpart; portion; sectionnoun