metallic melanism 银质沉着病
industrial melanism 工业黑化现象
melanism mutation 黑化突变
industrial development melanism 工业黑化现象
wheat melanism and brown necrosis 小麦黑化及褐坏死
N the condition in man and animals of having dark-coloured or black skin, feathers, etc. Industrial melanism is the occurrence of dark varieties of animals, esp moths, in smoke-blackened industrial regions, in which they are well camouflaged 黑变症
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