| 单词 | 雨层云 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔nimbostratus〕A low, gray, often dark cloud that precipitates rain, snow, or sleet.雨层云：一种呈深灰色的低云层，预示有雨、雪或冻雨美国传统〔nimbus〕A rain cloud, especially a low dark layer of clouds such as a nimbostratus.雨云：雨云，尤指象雨层云一样的深色低云层美国传统 |
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