| 单词 | natural frequency |
| 释义 | natural /nachˈ(ə-)rəl/adjective
ORIGIN: L nātūrālis, from nātūra nature natˈuralism noun
natˈuralist noun
naturalistˈic adjective Relating to or in accordance with nature, natural history or naturalism naturalistˈically adverb naturalīzāˈtion or naturalīsāˈtion noun natˈuralize or natˈuralise transitive verb
natˈurally adverb
natˈuralness noun natural abundance noun (physics) Same as abundance natural background noun The radiation due to natural radioactivity and to cosmic rays, enhanced by contamination and fallout natˈural-born adjective Native natural childbirth noun Childbirth with as little medical intervention, esp as little anaesthesia, etc as possible, relying on the mother doing special breathing and relaxation exercises natural classification see natural system below. natural cycle IVF noun IVF (qv) in which the woman is allowed to ovulate naturally rather than being given drugs to stimulate ovulation natural death noun Death owing to disease or old age, not violence or accident natural frequency noun
natural gas noun Gases issuing from the earth, whether from natural fissures or bored wells, applied particularly to the hydrocarbon gases associated with the production of petroleum and used as domestic or industrial fuel in place of town gas (see also North Sea gas under north) natural historian noun natural history noun Orig the description of all that is in nature, now used of the sciences that deal with the earth and its productions, ie botany, zoology and mineralogy, esp field zoology natural immunity noun That level of immunity with which a person is born (cf acquired immunity) natural killer cell noun A naturally occurring lymphoid cell which attacks and destroys tumour cells and some virally infected cells in the absence of prior immunization and without evident antigen specificity natural language noun A language which has evolved naturally, opp to artificial language natural law noun
natural logarithm noun One to the base e natural magic see under magic natural numbers plural noun The whole numbers 1, 2, 3 and upwards, sometimes also including 0 natural order noun (in botany) a category now usually called a family natural philosopher noun natural philosophy noun
natural radioactivity noun Radioactivity that is found in nature natural religion see natural theology below. natural resources plural noun Features, properties, etc of the land such as minerals, an abundance of water, timber, etc that occur naturally and can be exploited by human beings natural scale noun A scale of music written without sharps or flats natural science noun The science of nature, as distinguished from mental and moral science and from mathematics natural selection noun Evolution by the survival of the fittest with inheritance of their fitness by the next generation natural system or natural classification noun A classification of plants and animals according to presumed relationship by descent, distinguished in botany from the artificial system of Linnaeus natural theology or natural religion noun Religion derived from reasoned facts, not revelation natural therapy noun Treatment based on the ability of the body to heal itself natural virtues plural noun Those virtues (esp justice, prudence, temperance and fortitude) of which people are capable natural wastage noun (reduction of staff by) non-replacement of those who leave, eg through retirement natural year see under year |
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