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half-life

US 
UK 
  • n.半衰期;(放射性物质的)半衰期
  • Web半条命;战栗时空;半生期
Plural Form:half-lives  
half-life
n.
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

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