limestone coal group

例句：

1. 1. The company has a large limestone coal group in the northwest region.
   该公司在西北地区拥有一个大型的石灰石煤炭集团。
2. 2. The limestone coal group is responsible for producing electricity and heating.
   石灰石煤炭集团负责生产电力和供暖。
3. 3. The limestone coal group is expected to achieve significant growth in the coming years.
   预计石灰石煤炭集团在未来几年将实现显著增长。