Fog and low cloud cover are expected this afternoon.

预计今天下午有雾和低空云层。

《牛津词典》

Other features visible in the image include a solid field of low cloud cover at the lower left corner of the image.

图像中的其他可见特征包括密布于左下角的低云。

youdao

There was no moon, and under the low cloud cover a brisk unseasonable wind ruffled the Old Norwegian maples that lined the street and dropped a fine rain of spring buds on my shoulders and in my hair.

没月亮， 而且在低云彩盖子之下轻快不合时节地风翻动啦排行街道和投下春天芽美妙地雨在自己地肩膀和在自己地头发里地老挪威槭树。

youdao

There was no moon, and under the low cloud cover a brisk unseasonable wind ruffled the old Norwegian maples that lined the street and dropped a fine rain of spring buds on my shoulders and in my hair.

NEWYORKER: Wakefield

But when sun spot activity is low, a condition that can sometimes persist over decades and longer, the increased cosmic ray bombardment produces more cloud cover, hence cooling influences.

FORBES: Sorry, But With Global Warming It's The Sun, Stupid