焦炭渣

例句：

1. 1. The coal mine is located in the remote mountainous region.
   煤矿位于偏远的山区。
2. 2. Coal mining is a dangerous industry that requires special safety precautions.
   煤炭开采是一项危险的行业，需要特殊的安全措施。
3. 3. The coal-fired power plant generates electricity using coal as fuel.
   燃煤发电厂使用煤炭作为燃料来发电。