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微積分
calculus; infinitesimal calculusnoun
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
けど
but; however; althoughconjunction, particle
面白い。
interesting; fascinating; intriguing; amusing; funny; comical; enjoyable; fun; entertaining; good; satisfactory; favorablei-adjective