comparative map of coal seam and strat

例句：

1. 1.The mine manager drew a comparative map of the coal seam and strata to show the miners where to dig next.
   矿场经理绘制了煤层和地层的比较图，以指示矿工们下一步应该挖掘的位置。
2. 2. The geologist used this comparative map to study the distribution of minerals in the coal seam and strata.
   地质学家使用这个比较图来研究煤层和地层中矿物的分布情况。
3. 3. The engineers created a comparative map of the coal seam and strata to optimize the mining process.
   工程师们创建了一个煤层和地层的比较图，以优化采矿过程。