nuggar

例句：

1. 1. The coal mine is located in the mountainous region.
   煤矿位于山区。
2. 2. The coal-fired power plant produces electricity using coal.
   燃煤发电厂使用煤炭发电。
3. 3. The coal mine has been closed due to safety concerns.
   由于安全担忧，煤矿已经关闭。