| 单词 | cumulonimbus cloud |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔downburst〕An extremely powerful downward air current from a cumulonimbus cloud, typically associated with thunderstorm activity.下降气流：多与雷雨相关的来自积雨云的极强下降气流美国传统〔thundercloud〕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；积雨云美国传统 |
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