Business opportunities have a half-life, just like uranium.

商业机会有半衰期，就像铀一样。

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This radioactive element has a half-life of some 5, 700 years.

这种放射性元素半衰期约为5700年。

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Radioactive iodine has a half-life of eight days and decays naturally within weeks.

放射性碘的半衰期为八天，几周内自然衰变。

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It has a half-life of approximately three years at which time it stops decaying.

它生命的一半是三年,在三年的时候，它就停止衰亡。

麻省理工公开课 - 固态化学导论课程节选

But cesium-134, which has a half-life of only two years, clearly came from the meltdowns, the researchers say.

CNN: Fukushima tuna study finds minuscule health risks

Those hot stocks turned out to have a half-life not much longer than iodine-131's.

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This isotope, with a half-life of 2.6 million years, is not made in significant quantities by any process on Earth, but is expelled by supernovae.

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