含褐煤的

例句：

1. 1. The coal mine is located in the mountainous region.
   煤矿位于山区。
2. 2. Coal is a major source of energy for many industrial processes.
   煤炭是许多工业过程的主要能源来源。
3. 3. The coal industry has been struggling with environmental issues.
   煤炭行业一直在努力解决环境问题。