a coal-mine

• 煤矿

a coal-mine的用法和样例：

例句

1. He sketched the coal miner in a few minutes.
   他几分钟就画了一幅那位煤矿工人的素描。
2. The country is short of known deposits of coal.
   这个国家缺少已知的煤矿矿床。