naturally occurring isotope

例句：

1. 1.The study of naturally occurring isotopes can help us understand the origins of life on Earth.
   研究自然发生的同位素可以帮助我们了解地球上生命的起源。
2. 2. The team found a naturally occurring isotope that could be used to detect pollution in the air.
   该团队发现了一种自然发生的同位素，可以用来检测空气中的污染。
3. 3.The researcher discovered a naturally occurring isotope that could be used to improve crop yields.
   研究者发现了一种自然发生的同位素，可以用来提高农作物产量。