1. cumulus convection over tropical ocean 
   热带海洋上积云对流
2. a cumulus cloud at an intermediate altitude of 2 or 3 miles. 
   一种悬挂在中间高度为公里的积云。
3. An extremely dense, vertically developed cumulus with a relatively hazy outline and a glaciated top extending to great heights, usually producing heavy rains, thunderstorms, or hailstorms. 
   积雨云一种极其浓密的、垂直扩展的积云，其轮廓比较模糊，顶部覆有冰晶且向上伸入高空，通常能产生大雨、雷暴或雹暴

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