These men work underground for six hours at a time, mining coal.

这些人在地底下开采煤矿，一次工作6小时。

The mountains of Appalachia have lost 90 percent of their red spruce forests to logging and coal mining.

由于伐木和采煤，阿巴拉契亚山脉失去了百分之九十的红云杉林。

Nearly four hundred and fifty operators were mining coal, not even dimly foreseeing the day when their business would become a great railroad monopoly.

将近 450 名经营者从事煤炭开采， 甚至没有模模糊糊地预见到他们的业务有一天会成为铁路行业的大垄断企业。

Mining coal has led to accidents and diseases that kill coal miners, and burning coal has coated our cities, homes and lungs with layers of soot and poisonous chemicals, and left behind piles of toxic ash that pollute waterways.

采煤导致了导致煤矿工人死亡的事故和疾病，燃烧的煤炭使我们的城市、房屋和肺部覆盖了一层层煤烟和有毒化学物质， 并留下了成堆的有毒灰烬， 污染了水道。