ceroid

例句：

1. 1. The coal mine is located in the northern part of the country.
   煤矿位于该国北部。
2. 2. Coal mining is a dangerous job that requires special training.
   煤矿开采是一项危险的工作，需要特殊的培训。
3. 3. The coal industry has been declining due to environmental concerns.
   由于环境问题，煤炭行业一直在下降。