fair-weather cumulus
常见例句
- Cumulus clouds are big, white masses of fair-weather clouds that drift across the daytime sky. But heavy layers of cumulus clouds can threaten rain. (4)
積雲是白色的、標志著好天氣的大雲團，在白日的天空中飄浮。但是，厚厚的積雲層可能是要下雨的征兆。
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