isotope chart

例句：

1. 1. The isotopes were usedto determine the age of the rocks.
   这些同位素被用来测定岩石的年龄。
2. 2.The scientist drew an isotope chartto illustrate the distribution of elements in thesample.
   科学家绘制了一张同位素图表来说明样本中元素的分布情况。
3. 3. Theisotopes were used to study thebehavior of matter under extreme conditions.
   这些同位素被用来研究物质在极端条件下的行为。