nudism

(also naturism) n [U] practice of not wearing clothes, esp for health reasons 裸体主义（尤指因於健康有益）.

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, nucleus, nude, nudge, nudist, nudist camp (also nudist colony), nudity, nugatory, nugget, nuisance, null, nullification, nullify, nullity, numb, number, number one, numberless, numbly, numbness, numeracy, numeral, numerate, numeration,