stratification line

例句：

1. 1.The stratification line is the boundary between different soil layers.
   分层线是不同土壤层之间的界限。
2. 2.The geologist used a stratification line to delineate the area's geological features.
   地质学家使用分层线来界定该地区的地质特征。
3. 3.The stratification line is crucial for understanding the distribution of minerals in the earth's crust.
   分层线对于理解地球地壳中矿物分布至关重要。