好像是乌云密布的天空顷刻间阳光四射。
一片乌云密布的天空会下雷阵雨，这一点是不言而喻的。
That it would shower, with a sky so full of blackening thunder-clouds, would scarcely be thought worthy of comment.
他们很伤心，因为乌云密布的天空让他们看不到地球上的人啦。
They were sad because it was cloudy and they couldn't look down upon the people on earth.
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