coal mining

例句：

1. 1. The coal mineis located in the remote mountainous region.
   煤矿位于偏远的山区。
2. 2. Coal mining has been amajor industry for many years.
   煤炭开采多年来一直是一个重要的行业。
3. 3. The miners are exposed to dangerous conditions while workingunderground.
   矿工们在地下工作时暴露在危险的条件下。