nuclear winter

period without light, heat or growth which would follow a nuclear war 核冬天（核战争带来的无光、 无热或无生长物的时期）

now that, nowadays, nowhere, noxious, noxiously, noxiousness, nozzle, nr, NSB, NSPCC, NT, nth, nuance, nub, nubile, nuclear, nuclear disarmament, nuclear energy (also nuclear power), nuclear family, nuclear war, nuclear-free, nucleate, nucleic acid, nucleolus, nucleus, nude, nudge, nudism, nudist, nudist camp (also nudist colony), nudity, nugatory, nugget, nuisance, null, nullification, nullify, nullity, numb, number,