Nullarbor Plain
— Noun
– English
～ a vast arid plain of southern Australia stretching inland from the Great Australian Bight; has sparse vegetation and no surface water and is almost uninhabited; the site of a major rocket research center
natural family planning
— Noun
– English
～ any of several methods of family planning that do not involve sterilization or contraceptive devices or drugs; coitus is avoided during the fertile time of a woman's menstrual cycle