That means it needs to be efficiently stored so it can be utilized on cloudy, windless days and at night.

再生能源需要有效的存储，才能在多云、无风天气及夜晚得以使用。

youdao

It is often cloudy or misty, and it rains now and.

它经常多云或有雾，它现在又下雨了。

youdao

It was a cloudy day in a winter, I pedaled my bicycle fast than usual on the way to my classroom because it was only a few minutes before class and I didn't want to be late.

那是一个阴云密布的冬日，我像往常一样，飞快地踩着自行车驶向教室，因为还有几分钟就要上课了，我不想迟到。

youdao

When it was cloudy - or when there were flurries of snow - the landscape appeared almost lunar and barren, and it was impossible to imagine any kind of animals enduring here.

BBC: Threat to life on Arctic frontline