coal silt

例句：

1. 1. The coal mine was filled with coal silt, making it difficult to breathe.
   煤矿里充满了煤尘，使得呼吸变得困难。
2. 2. The coal sludge had been contaminated by heavy metals, posing a serious threat to the environment.
   煤泥被重金属污染了，对环境构成了严重的威胁。
3. 3. The coal mining industry is heavily dependent on coal sludge for its production processes.
   煤炭开采业严重依赖煤泥来进行其生产过程。