壁炉里堆满了煤块。
The fireplace was stocked with lumps of ___coal.
矿工从矿层中开采出一大块煤。
The miner extracted a large lump of ___coal from the seam.
开采金、煤或石油是我们经济的一个选择。
Mining for gold, ___coal, or oil is an option for our economy.
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