煤矿工人

例句：

1. 1. He has been a coal miner for over 30 years.
   他已经当煤矿工人30多年了。
2. 2.The coal mine is dangerous and requires special training.
   煤矿工作危险，需要特殊培训。
3. 3.Coal mining has become a major industry in China.
   煤炭开采已成为中国的主要产业。