煤矿矿井

例句：

1. 1. The coal mine is locatedin the mountains.
   这个煤矿位于山区。
2. 2. Theminers are working hard to extract thecoal.
   矿工们正在努力开采煤炭。
3. 3. Themine has been closed due to safety concerns.
   由于安全担忧，这个矿已经关闭了。