coal-seams correlation

例句：

1. 1.The study of coal seam correlation is crucial for the development of new mining techniques.
   研究煤层相关性对于开发新的采矿技术至关重要。
2. 2. The correlation between coal seam thickness and mining efficiency has been studied extensively.
   煤炭层厚度与开采效率之间的相关性已经得到了广泛的研究。
3. 3. The correlation between methane emissions and coal seam depth is well-established.
   甲烷排放量与煤层深度之间的相关性已经被广泛认可。