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素粒子物理学
particle physicsnoun
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
分野
field; area; domain; branchnoun
だ。
plain copulagrammar