half-life

英汉释义

• na.

  1.【核】半衰期〔放射性同位素分裂[从生物体中排出]一半量的时间〔也作 half life 或 half life period〕〕

英英释义

• n.

  1.the amount of time that is needed for a substance to lose one half of its radioactivity

英汉例句

• 1.It is not necessary to wait until half of a sample has decayed in order to measure the halflife.

  不必一直等到样品衰变一半之后才测量它的半衰期。