Quantum tunneling is involved in many physical processes, such as radioactive decay and the nuclear fusion that takes place in the Sun.

量子隧穿发生在许多的物理过程中，比如说放射性衰变和太阳上发生的核聚变。

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As the researchers pored through published data on specific isotopes, they found disagreement in the measured decay rates - odd for supposed physical constants.

当研究者核对已经出版的同位素的数据时，他们发现查到的值和测量到的衰变速率不一致，而这个速率被物理学家假定是一个物理常量。

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TRNGs are usually based on physical phenomena such as thermal noise, atmospheric noise, radioactive decay and even coin-tossing.

真随机数发生器的熵源通常来自于真实的物理世界，如热噪声，大气噪声，放射性衰减甚至掷硬币。

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The physical decay is evident and these areas suffer all the social problems associated with inner-city poverty.

ECONOMIST: Brazilian cities

Physical decay accounts for much of the problem.

ECONOMIST: Russia��s part-time president

The physical anthropologist who carried out the examinations, Professor Andrea Cucina said the work could have been done to treat tooth decay, and suggested some plant or other material, which would have since decayed, could have been inserted into the hole.

BBC: Prehistoric dentistry evidence found