isotopic element

例句：

1. 1. The study of isotopic elements is crucial for understanding the Earth's history.
   研究同位素元素对于理解地球历史至关重要。
2. 2. The team used a mass spectrometer to analyze the isotopic composition of the sample.
   该团队使用质谱仪分析了样本的同位素组成。
3. 3. The discovery of new isotopic elements has opened up new possibilities in materials science.
   新同位素元素的发现为材料科学开辟了新的可能性。