砧状云(anvil cloud)是雷雨云的顶部冰晶结构，通常单体状，呈马骔状，极象打铁的铁砧而得名，雷雨过后多见。
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... 砧云：incus 砧积云：anvil cloud 真正安全的：intrinsically safe ...
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cloud anvil 云砧
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It's a huge towering dark cloud, shaped at the top like a blacksmith's anvil, and responsible for sudden downpours.
BBC: Weather talk: Is there a way to make it interesting?
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