The Alps expect heavy cloud over the weekend with light snow flurries and strong winds.

阿尔卑斯山预计周末是多云，有小阵雪和强风。

《柯林斯英汉双解大词典》

The digitized radar echo patterns under different heavy cloud clusters are revealed.

揭示了云图上不同种类暴雨云团下的数字化雷达回波模式。

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Heavy cloud obscured much of the spectacle and disappointed thousands of sky-watchers who had gathered.

在很多地方，厚厚的云层遮盖了(日全蚀的)奇景，令数以千计聚集的人失望而回。

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Any ambient starlight or moonglow is diffused by heavy cloud, and the road is simply too twisty to get any solid idea of direction.

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But heavy cloud ruined the event for many UK skywatchers.

BBC: You are in: Sci/Tech

These systems must be smart enough to independently switch back and forth from solar when the sun is out to fuel at night or when there is heavy cloud cover.

ENGADGET: Marines eye solar energy to eliminate dependency on fuel generators (video)