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。
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。
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。
应用推荐