epigenite

例句：

1. 1. The epigean layer is the topmost layer of soil that plants can access.
   表土层是植物可以接触到的最顶层土壤。
2. 2. The soil in this region is rich in nutrients, making it ideal for growing crops.
   该地区的土壤富含养分，非常适合种植作物。
3. 3.Epigenetics studies how genes are expressed and regulated without changing the DNA sequence.
   表观遗传学研究基因如何表达和调控，而DNA序列不变。