isopachic

例句：

1. 1. The study of isotopes has led to important discoveriesin 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 team used isotopes to track the movement of the water.
   该团队使用同位素来追踪水的移动。
3. 3. The discovery of new isotopes has opened up new possibilities for medicaltreatments.
   新同位素的发现为医学治疗开辟了新的可能性。