AnalyzerSentence analysis3SpansSentence苦労を重ねる1000 character limitAnalyzeSentence苦く労ろうを重かさねるSpan Details苦く労ろうtrouble; hardship; difficulty; labor; toil; pains; anxiety; worry; concern; caresnoun, suru verbをobject markergrammar重かさねるpile up; stack; put on top of another; repeat many times; accumulate; go through repeatedlyichidan verb