cumulus
cumulus[ˈkjuːmjʊləs](pl. cumuli -ʌɪ, -liːn)- [mass noun](Meteorology)cloud forming rounded masses heaped on each other above a flat base at fairly low altitude
(气象)积云
cumulousadjective语源- mid 17th cent. (denoting a heap or an accumulation): from Latin, heap'
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