coal seam group

例句：

1. 1. The coalseam group is responsible for the extractionof large amounts of energy from the earth's crust.
   煤层群负责从地球地壳中提取大量的能源。
2. 2. The coalseam group plays a crucial role inthe production of electricity and heat.
   煤层群在电力和热能的生产中起着至关重要的作用。
3. 3. The coal seam group isan important source of raw materials for thechemical industry.
   煤层群是化学工业的重要原料来源。