coal seam boundary

例句：

1. 1.The coal seam boundary is crucial for the safe mining of coal.
   煤层边界对于煤矿的安全开采至关重要。
2. 2. The geologists used a new technique to determine the exact location of the coal seam boundary.
   地质学家使用了一种新技术来确定煤层边界的确切位置。
3. 3.The coal seam boundary is often difficult to identify, requiring advanced equipment and expertise.
   煤层边界往往难以识别，需要先进的设备和专业知识。