Either the sky is completely overcast, or the sky is blue with one single cloud and that cloud is raining.

天空要么全阴，要么就是蔚蓝的天空上孤零零飘着一朵云，而那朵云也是雨云。

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Either the sky is completely overcast, or the sky is blue with one single cloud and that cloud is raining.

天空要么全阴，要么就是蔚蓝的天空上孤零零飘着一朵云，而那朵云也是雨云。

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