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Sentence analysis
5Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
難問
difficult question; difficult problem; perplexitynoun, suru verb
に
direction, time, indirect object, or target markergrammar
は
topic markergrammar
歯が立たない。
unable to compete with; no match for; can't make a dent in; hard to chew; toughexpression, i-adjective