天空布满了灰色的云层。
天空布满了灰色的云彩。
然后，突然，乌云密布。
Snow fell gently from gray clouds.
白雪从灰蒙蒙的云层中轻轻地飘落。
The sky was barred with gray clouds.
天空满布着灰色的云层。
Father: Yeah. But sometimes clouds are gray.
爸爸：是的。但是有时候云是灰色的。
The little white clouds were now large and gray.
小小的白云变成了大大的黑云。
The machine emits clouds of gray smoke.
这台机器释放出灰色的烟雾。
The machine emits clouds of gray smoke.
这台机器释放出灰色的烟雾。
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