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单词	half-lifes
释义	half-life noun ˈhaf-ˌlīf  ˈhäf- 1 : the time required for half of something to undergo a process: such as a : the time required for half of the atoms of a radioactive substance to become disintegrated b : the time required for half the amount of a substance (such as a drug, radioactive tracer, or pesticide) in or introduced into a living system or ecosystem to be eliminated or disintegrated by natural processes 2 : a period of usefulness or popularity preceding decline or obsolescence slang usually has a short half-life Word History First Known Use 1907, in the meaning defined at sense 1 Kids Definition half-life noun ˈhaf-ˌlīf, ˈhäf- plural half-lives -ˌlīvz : the time required for half of the atoms of a radioactive substance to change composition Medical Definition half-life noun ˈhaf-ˌlīf  ˈhȧf- : the time required for half of something to undergo a process: as a : the time required for half of the atoms of a radioactive substance to become disintegrated b : the time required for half the amount of a substance (as a drug or radioactive tracer) in or introduced into a living system or ecosystem to be eliminated or disintegrated by natural processes the serum half-life is about 2 days Journal of the American Medical Association half-lifes noun variants or half-lives plural of half-life as in lifetimes Synonyms & Similar Words Relevance lifetimes durations runs times dates spans terms continuances ages lives tenures life spans longevities standings tours hitches spells stretches turns
随便看	totis viribus totitives toto toto caelo toto coelo totoaba Totonac totonaca Totonacan totonacas totonaco totonacos totonacs totora totquot tots tots (up) tots up totted totted (up) totted up Tottenham Tottenham pudding totter tottered

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