Even an avalanche of light power can be dangerous, but the Peruvian catastrophe was particularly terrible because it was caused by a heavy layer of ice.

即使是光能的雪崩也可能是危险的，但秘鲁的灾难尤其可怕，因为它是由厚厚的冰层造成的。

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A heavy layer of volcanic ash rained down over the Aegean, covering islands and crops.

浓厚的火山灰层大量降下到爱琴海，遮盖了岛屿和农作物。

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Wearing loose, lightweight clothes, one layer another, is better than a single heavy layer of clothing.

尽量穿宽松，轻便的衣服，一层一层的套衣服比穿一件厚重的衣服要好。

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Zhong Yu of Greenpeace told the BBC's Chinese service there was a heavy layer of oil covering the coastline.

BBC: China oil spill after pipe blast 'worse than thought'

The sides shared a point in the corresponding fixture earlier this season, but the visitors are coming to Layer Road high on confidence after a heavy defeat of Southampton on Saturday.

BBC: Williams refuses to give up fight

The explosions were accompanied by heavy rain, leaving the island's roads coated in a thick layer of mud.

BBC: Ash rains down on Montserrat