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Sentence
Span Details
重質油
heavy oilnoun
は
topic markergrammar
精製
refining; purification; careful manufacture; meticulous productionnoun, suru verb
が
subject 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