Robert and Slogger were still cutting coal when David reached them.
当大卫到达罗伯特和斯洛格跟前时,他们还在。
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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.
采导致了导致
矿工人死亡的事故和疾病,燃烧的
炭使我们的城市、房屋和肺部覆盖了一层层
烟和有毒化学物质, 并留下了成堆的有毒灰烬, 污染了水道。