单词	cumulonimbus
释义	cumulonimbus /ˌkjuːmjʊləʊˈnɪmbəs / noun (plural cumulonimbi /ˌkjuːmjʊləʊˈnɪmbʌɪ/) [mass noun] Meteorology Cloud forming a towering mass with a flat base at fairly low altitude and often a flat top, as in thunderstorms: the development of clouds from fair-weather cumulus to giant cumulonimbus [count noun]: those clouds that will build west of Baltimore late Sunday afternoon are cumulonimbi... The rising air cools and produces towering cumulus and cumulonimbus clouds. The rising air is associated with a region of low air pressure, towering cumulonimbus clouds and rain. As air rises in a large cumulonimbus or thunderhead cloud condensation occurs and all three forms of water are present. Rhymes nimbus
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