now and then

时而,不时

nougat, nought, noughts and crosses (US tick-tack-toe), noun, noun phrase, nourish, nourishing, nourishment, nous, nouveau riche, Nov, nova, novel, novelette, novelist, novelty, November, novice, noviciate (also novitiate), now, 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,