mine locomotive

例句：

1. 1. The mine is located in the mountains.
   这个矿井位于山区。
2. 2. The miners are working hard to extract the coal.
   矿工们正在努力开采煤炭。
3. 3. Mining has become a major industry in this region.
   采矿业已成为该地区的主要产业。