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

The heavier cloud cover to the north and west of this circular pattern was likely a response to a low-pressure system and to jet stream dynamics.

圆形的云型中，北部和西部云量更多，这可能是由于低压系统和急流的作用。

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