isotope labeling

例句：

1. 1. The scientists used isotopes to trace the origin of the water in the river.
   科学家们使用同位素来追踪河流中水的源头。
2. 2. The process of isotopes labeling is crucial for understanding the behavior of matter.
   同位素标记过程对于理解物质的行为至关重要。
3. 3. The researchers are conducting isotopes labeling experiments on a new material.
   研究人员正在对一种新型材料进行同位素标记实验。