half-life

noun

1. （放射性物质的）半衰期
   the time taken for the radioactivity of a substance to fall to half its original value
2. 半衰期
   the time taken for the concentration of a reactant to fall to half of its original value in a chemical reaction

1. （放射性物质的）半衰期
   The half-life of a radioactive substance is the amount of time that it takes to lose half its radioactivity.

1. The half-life of a business model is declining.
   商业模式的半衰期正在缩短。
2. During the industrial era the half-life of a business model was typically measured in generations.
   在工业时代，商业模式的半衰期通常按世代（约30年）来计算。
3. We can talk about the half-life of a radioactive isotope, and indeed we can measure and state very very precisely what that half-life is.
   我们可以谈论放射性同位素的半衰期，我们确实可以非常准确地测量和描述半衰期是什么。
4. Its peak plasma concentration is attained within one hour and it has half-life of elimination of70-90 minutes.
   1小时内其血药浓度可达高峰，其半衰期为70～90分钟。
5. So, the half-life is just the time that it takes for half of the reactants to disappear.
   半衰期实际上是，一半反应物消失的时间。
6. The half-life of francium is 22 minutes.
   钫的半衰期是22分钟。
7. Effects of anesthesia and surgery on the half-life of plasma sodium salicylic in laboratory animals
   麻醉和手术对实验动物血浆药物半衰期的影响
8. The degradation dynamic, half-life and degradation factors of chlorpyrifos in vegetables, fruits and soils are summarized.
   综述了毒死蜱在蔬菜、水果、土壤中的降解动态、半衰期以及影响药物降解因素等方面的研究现状。
9. Serous half-life is relatively longer, it is3~ 7 hours mostly above;
   血浆半衰期相对较长，大多为3～7小时以上；
10. The more dangerous methyl mercury, known to damage nerves, has a half-life of44 days.
    而更危险的甲基汞（可损伤神经）的半衰期是44天。
11. The time it takes for half of its original amount to decay is called the half-life.
    衰变至只剩下原来数目一半所需的时间称为该核素的半衰期。
12. Water and fish through a river, the fish only Half-Life.
    水和鱼经过了一条大河，鱼只剩下半条命。
13. A radioactive, inert, gaseous isotope of radon, with a half-life of3.92 seconds.
    氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒。
14. For most drugs, half-life remains the same regardless of how much drug is in the body.
    对多数药物而言，不管它在体内有多少，它的半衰期都是相同的。
15. Current Status and Progress on the Techniques for Prolonging Half-life of Protein Pharmaceuticals
    蛋白质药物长效化技术的现状和进展
16. Their half-life in the body is estimated to be seven to eleven years.
    它们在体内的半衰期估计为7至11年。
17. It has a half-life of approximately three years at which time it stops decaying.
    它生命的一半是三年，在三年的时候，它就停止衰亡。
18. The half-life of a VP of Sales or Marketing in some industries is18 months.
    在某些行业中，VP营销的中期寿命大约是18个月。
19. Even Francium's most stable isotope, Francium-223 only has a half-life of22 minutes.
    钫的最稳定的同位素，钫-223也只有22分钟的半衰期。
20. Scientists estimate the half-life of CO2 might be close to a hundred years.
    科学家估计，二氧化碳的半衰期可能接近于100年。
21. Sparfloxacin is a new fluroqui nolones which has a long half-life time, perfect tissue penetration, broad spectrum.
    司帕沙星是一种消除半衰期长，组织渗透力强，抗菌谱广的新型喹诺酮类抗菌药物。
22. Thermal stability experiments also exhibited that caffeic acid could inhibit the fading rate of anthocyanins, and increase their half-life and activation energy.
    热稳定性实验结果表明，添加咖啡酸能抑制花色苷因热褪色的速率，而增加花色苷褪色反应的半衰期和活化能。
23. But the half-life of these fake packages has been getting shorter.
    但是，这些“伪”方案的半衰期变得越来越短。
24. Now it's obvious that ethyl mercury's short half-life prevents toxic build-up from occurring.
    现在可明显看出，硫柳汞的短半衰期避免了毒性的积累并发生。
25. But by and large, the citation rate of papers is a good proxy for the half-life of knowledge.
    但除了这些特例，基本上论文引用率还是很适合代表知识半衰期的。
26. Half-life: time taken for blood concentration to fall to half its peak value after a single dose.
    半衰期：在一次剂量服用后药物血液浓度降至最高峰一半时所需的时间。
27. Evolutionists have recently learned that groups of species also have what might be called a half-life.
    进化论者最近发现生物属种也具有一种可以称为半死亡期的时期。

noun

1. the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)

   Synonym:    half life