coal mine 是煤矿的意思，是可数名词。
例句：
Most of the miners were rescued from the coal mines.
大多数矿工从煤矿里被救了出来。
He tried to regularize the management of coal mines.
他试图将煤矿的管理系统化。
Finding a fossil in a coal mine is no big deal.
在煤矿里发现化石并不是什么大不了的事。
There were five survivors in the coal mine accident.
煤矿事故中有五名幸存者。
The coal mine is not well-ventilated.
煤矿的通风不甚好。
An explosion in a coal mine in southern Russia killed at least 66 people.
俄罗斯南部的煤矿爆炸造成至少66人死亡。
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