boundary clay

例句：

1. 1. The construction of the new highway will require the removal of boundary clay from the area.
   新高速公路的建设将需要从该地区移除边界粘土。
2. 2.The scientist found that the boundary clay had a unique chemical composition.
   科学家发现边界粘土具有独特的化学成分。
3. 3. The boundary clay was used as a natural barrier to prevent soil erosion.
   边界粘土被用作天然屏障，以防止土壤侵蚀。