| 单词 | thundercloud |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔sheet lightning〕Lightning that appears as a broad, sheetlike illumination of parts of a thundercloud, caused by the reflection of a lightning flash.片状闪电：一种由闪电的反射引起的宽广的、象片状的雷电发光部分美国传统〔thundercloud〕We watched the gathering thunderclouds.我们观察着正在聚拢的雷雨云。韦氏高阶〔thunderhead〕The swollen upper portion of a thundercloud, usually associated with the development of a thunderstorm.雷雨云砧，雷暴云砧：雷云上部通常与雷暴的发展有关系的膨胀部分美国传统 |
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