half-life
短语
FREQ #43156
n. 半衰期, 半排出期 [化] 半衰期; 半寿期
发音
US
/ˈhæfˌlaɪf/
词形变化
half-lives
复数
half-lives
别名
halflife
释义与例句
n.
-
1.
The time required for half the nuclei in a sample of an isotope to undergo radioactive decay.
半衰期
-
2.
In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.
化学 -
3.
The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.
医学 -
4.
The amount of time it takes for an idea or a fashion to lose half of its influential power.
Most books of scholarship have surprisingly short intellectual half-lives during which they make a difference"
词汇关系
上位词 3
词源
From half- + life.
来源：wiktionary