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Sentence
Span Details
常
-noun
螺旋
spiral; helix; screwnoun
面
-noun
は
topic markergrammar
極小
minimum; minuscule; extremely small; local minimumna-adjective, noun
曲面
curved surfacenoun
の
possession, attribution, nominalizer, or nominal linkergrammar
一種
a kind; a sort; a variety; a species; a sort of; of sorts; something of a; sort of; somewhatnoun, adverb
です。
polite copulagrammar