isotope geochemistry

例句：

1. 1.The scientists discovered a new type of isotope.
   科学家们发现了一种新的同位素。
2. 2.The study of isotopes has led to important discoveries in physics and chemistry.
   研究同位素导致了物理学和化学的重要发现。
3. 3. The isotope ratios can be used to determine the age of rocks.
   同位素比率可以用来确定岩石的年龄。