1·A big black cloud, stormy sky.
乌云，暴风雨天空。
2·The black cloud threatened rain.
乌云预示就要下雨了。
3·A black cloud appears over the castle.
乌云出现在城堡的上方。
4·This black cloud rose high into the sky.
这个黑色的云升得高高的天空。
5·Look at the black cloud. It's going to rain.
看那些黑云，天要下雨了。
6·'it's a looming epidemic; it's like a big black cloud.'
这是传染性的，好像一大朵乌云。
7·But if you look at other places, you see this black cloud?
不过如果你看向其他地方，你看到这个黑云了吧？
8·This coincided with a black cloud which suddenly veiled the sun.
这时一团乌云忽然遮住了太阳。
9·Melancholy is a black cloud which can change one's state of mind!
忧愁是一朵黑云，可以改变人的精神状态！
10·When they argue, it's like a big, black cloud hanging over our home.
当他们争吵的时候，就像有一大团乌云笼罩在我们家。