isotope mass spectrometer

例句：

1. 1. The study of isotopes has led to important discoveries in physics and chemistry.
   同位素的研究在物理学和化学中导致了重要的发现。
2. 2.The scientists used the isotope to trace the origins of the water.
   科学家们使用同位素来追踪水源的起源。
3. 3.The isotope ratio can be used to determine the age of rocks.
   同位素比可以用来确定岩石的年龄。