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单词 cumulonimbus calvus cloud
释义 cumulonimbus calvus cloud
[¦kyü·myǝ·lō`nim·bǝs `kal·vǝs ´klau̇d]
METEOROLOGY
A species of cumulonimbus cloud evolving from cumulus congestus: the protuberances of the upper portion have begun to lose the cumuliform outline; they loom and usually flatten, then transform into a whitish mass with a more or less diffuse outline and vertical striation; cirriform cloud is not present, but the transformation into ice crystals often proceeds with great rapidity.
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