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half-life 【原子能】半衰期〔放射性同位素分裂[從生物體中排出]一半...

half-long

Evolutionists have recently learned that groups of species also have what might be called a half-life . 進化論者最近發現生物屬種也具有一種可以稱為半死亡期的時期。

The half-life of francium is 22 minutes . 鈁的半衰期是22分鐘。

It has a half-life of about 41/2 billion years . 它的半衰期大約為45億年。