专家们说相关辐射危险性很小，因为氮的同位素氮16只会存在5秒钟。

Experts have played down the dangers, arguing that the isotope of nitrogen known as nitrogen-16 lasts for only five seconds.

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但是空气中的氮气中的氮原子却会被一个叫做同位素的有着不同数量中子的氮原子所替换。

But the nitrogen in the air was replaced with a nitrogen atom with a different number of neutrons, called an isotope.

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科学家认为重氮来自一颗彗星，而重氧则是来自行星形成的自然过程，这一过程把更轻的氧同位素留在了星云中，形成了太阳。

Scientists say the excess heavy nitrogen could have come from a comet. And the heavier oxygen from a natural process that left more of the light isotope in the part of the nebula that made the sun.

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