Burning coal is nasty business, concentrating all kinds of toxic metals and resulting in potentially deadly fly ash.

烧煤是一件危害极大的事，释放各种有毒金属，并导致潜在的致命灰尘。

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We have been excavating layers of ash almost six metres thick, which suggests that they might have kept the fire burning all winter.

我们一直在挖掘一层层的积灰，几乎有六米厚，这说明他们可能整个冬季都在烧火。

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We have been excavating layers of ash almost six metres thick, which suggests that they might have kept the fire burning all winter.

我们一直在挖掘一层层的积灰，几乎有六米厚，这意味着他们可能整个冬天都在烧火。

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We have been excavating layers of ash almost six metres thick, which suggests that they might have kept the fire burning all winter.

我们一直在挖掘一层层的积灰，几乎有六米厚，这意味着他们可能整个冬天都在烧火。

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