英语词汇“half-life”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	half-life
释义	half-life I. \ˈ ̷ ̷ˌ ̷ ̷\ noun also half-life period 1. : the time required for half of the atoms of a radioactive substance present at the beginning to become disintegrated < rays from uranium have a half-life of millions of years — F.B.Colton > < this isotope has half-life of twenty-three minutes — L.J.Levert > < there will still be one quarter of the element left at the end of two half-life periods — G.E.Owen > 2. : the time required for half the amount of a substance (as a drug or radioactive tracer) in or introduced into a living system to be eliminated whether by excretion, metabolic decomposition, or other natural process II. noun : a period of usefulness or popularity preceding decline or obsolescence < slang has a short half-life >
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