卷积云

例句：

1. 1. The weather forecast predicted a stormyday with possible thunderstorms.
   天气预报预测了有暴风雨的可能。
2. 2. The scientist observed theformation of a cumulonimbuscloud over the mountain range.
   科学家观察到了一座山脉上空形成卷积云。
3. 3. Thecumulonimbus cloud was sodense that it blocked out the sun forhours.
   卷积云如此密集，以至于它遮蔽了太阳数小时。