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Sentence analysis
6Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
理論
theorynoun
の
possession, attribution, nominalizer, or nominal linkergrammar
体系
system; framework; structurenoun, noun suffix
は
topic markergrammar
難しい。
difficult; hard; complicated; serious; tricky; hard to handle; not feasible; difficult to do; not possible; fussy; particular; hard to please; sullen; glum; serious-looking; dirty; unclean; detestable; unpleasant; uncomfortable; creepyi-adjective