zone of secondary enrichment

例句：

1. 1. The research in this area has been greatly enriched by recent advances in technology.
   这一领域的研究因近期技术的进步而大大丰富。
2. 2.The zone of secondary enrichment is where the most significant changes occur.
   次级富集区是发生最显著变化的地方。
3. 3.The study of this zone is crucial for understanding the distribution and behavior of rare earth elements.
   研究这个区域对于理解稀土元素分布和行为至关重要。