煤矿业的

例句：

1. 1. The coal mine is located inthe mountainous area.
   煤矿位于山区。
2. 2. Coal is a major source of energy formany countries.
   煤炭是许多国家的主要能源来源。
3. 3. The coal industry has been declining due to environmental concerns.
   由于环境问题，煤炭行业正在下降。