A cumulonimbuscloud rises high into the sky and usually produces storms.
积雨云上升到空中，通常会带来暴风雨。
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Cumulonimbus, along with cumulus, are the most dramatic types of cloud.
积雨云和积云是云中最神奇的类型。
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Sticking with the elephant unit, Heymsfield estimated that a typical thunderstorm cloud — a cumulonimbus — has 15 million elephants worth of water floating in the air at any given time.