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half-life

/ˈhæf ˌlaɪf/

翻译: 指某一量减少到其初始值一半所需的时间,尤指放射性物质中一半原子发生衰变所需的时间。

1 个条目

noun

/ˈhæf ˌlaɪf/C1formalscientific
  • zh指某一量减少到其初始值一半所需的时间,尤指放射性物质中一半原子发生衰变所需的时间。

The time required for a quantity to reduce to half its initial value, especially the time taken for half the atoms in a radioactive substance to undergo decay.

  1. Radioactive decayB2formalscientific

    The time required for half of the atoms in a radioactive substance to undergo decay.

    zh半衰期

    • The half-life of carbon-14 is about 5,730 years.
    • Scientists use half-life to date ancient artifacts.
    • Uranium-238 has a half-life of 4.5 billion years.
  2. General declineC1formalscientific

    The time it takes for any quantity or substance to reduce to half its initial amount.

    zh半衰期

    • The half-life of a drug in the bloodstream determines dosage frequency.
    • Environmental pollutants have varying half-lives in soil.
    • The half-life of a chemical reaction depends on temperature.
词形
  • half-lives plural form
  • half-lives' possessive plural form
  • half-life's possessive singular form