nucleus

n.(原子)核；核心，中心

noxiousness, nozzle, nr, NSB, NSPCC, NT, nth, nuance, nub, nubile, nuclear, nuclear disarmament, nuclear energy (also nuclear power), nuclear family, nuclear war, nuclear winter, nuclear-free, nucleate, nucleic acid, nucleolus, nude, nudge, nudism, nudist, nudist camp (also nudist colony), nudity, nugatory, nugget, nuisance, null, nullification, nullify, nullity, numb, number, number one, numberless, numbly, numbness, numeracy,