当天空乌云密布时候 When skies were grey
天空乌云密布
The sky is overcast
以上为机器翻译结果，长、整句建议使用 人工翻译 。
有一小片孤零零的金盏花，如果天空乌云密布，它就会匆忙地闭合。
There is a little single marigold which shuts up in a hurry if the sky becomes clouded.
youdao
天空乌云密布，阴沉沉的。
The sky was dark and threatening.
《牛津词典》
天空乌云密布， 电光在云块间闪动。
The sky was overcast, the ligtning leaped from cloud to cloud.
《新英汉大辞典》
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