isotope isomer

例句：

1. 1. The scientists are studying the isotopes of uranium to find out how they react with other elements.
   科学家们正在研究铀的同位素，以了解它们与其他元素的反应。
2. 2.The chemist used an isotope to create a new compound that had different properties from its parent compound.
   化学家使用一种同位素来创造一种新的化合物，其性质与母化合物不同。
3. 3.The study found that the isotope ratios in the rocks could help determine the age of the earth's crust.
   研究发现，岩石中的同位素比率可以帮助确定地球地壳的年龄。