1. A large dark cloud charged with electricity and producing thunder and lightning; a cumulonimbus cloud. 
   雷云大片充满电且能制造雷声和闪电的乌云；积雨云
2. A rotating column of air usually accompanied by a funnel-shaped downward extension of a cumulonimbus cloud and having a vortex several hundred yards in diameter whirling destructively at speeds of up to500 miles(800 kilometers) per hour. 
   龙卷风，陆龙卷一种纵向的气旋，伴随有倒漏斗形的积雨云，涡流直径达几百码，以每小时五百英里（八百公里）的速度移动，其旋转具有极大的毁坏性
3. That's what is technically cumulonimbus. 
   这云的学名是积雨云。
4. Cloud Terrace at Juyongguan 
   居庸关云台
5. A cloud of locusts. 
   一群蝗虫

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• 1. 鬃状积雨云
  cumuliform cloud 积状云...cumulonimbus capillatus cloud 鬃状积雨云...cumulus cloud 积云
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