The explosion caused a huge black cloud of dust.

Watch the black cloud crawling nearer

看着黑色的乌云越来越近

Unexpectedly, a shroud of black cloud like a big mushroom rose in the distance immediately as if an atom bomb exploded.

没想到远处立刻升腾起蘑菇状的黑云（同原子弹爆炸一样的反应）

His unhappy face turned into a smile, and the black cloud that hung over his head turned into sunshine.

慢慢地，司机不高兴的脸变为笑脸，他头上的乌云变为阳光。

When the races were over, and we turned our faces homeward, one of the party noticed a black cloud drifting in from the sea, which grew and spread and thickened until it covered the whole sky.

就在比赛结束，我们正准备回家的时候，人群里有个人发现从海上飘来了一团黑云。这团黑云迅速地扩散增厚，直到遮蔽了整个天空。

This coincided with a black cloud which suddenly veiled the sun.

这时一团乌云忽然遮住了太阳。

After school I wanted to buy some Cn food from CNT but I changed my mind when I saw the black cloud all over the sky.

放学后我想从唐人街买一些中国食品，但是当我看到天上黑压压的乌云的时候，我改变了主意。

Before he could picture the rickshaw, this other thing would stealthily slip out to occupy his mind like a black cloud, obscuring the sun.

还没想到车，这点东西已经偷偷的溜出来，占住他的心，像块黑云遮住了太阳，把光明打断。

Brother Tianshuo, is a beetle-browed and plump black cloud.

朔哥，是一朵喜欢皱着眉头的胖乎乎的乌云。

And yeah, the black cloud faded a little bit, but so did all the work, because I was just floating along.

乌云似乎有点消散了，但工作也是，因为我如坠云中。

The entire top of the mountain exploded, and a huge black cloud rose into the air.

整个山顶爆裂开来，一团巨大的黑云升入空中。

While I knew I shouldn't let it, the mailman's morning delivery of another rejection letter for an article I'd submitted to a magazine made me feel like a black cloud of failure hung over my head.

虽然我知道自己不该这样，但是早班邮差送来的又一封我给杂志投稿的退稿信就象是一片失败的乌云挂在我的头顶上。

Black cloud says the party's over!

乌云说派对结束了！

Time and the bell have buried the day, The black cloud carries the sun away.

时间和晚钟埋葬了白天，乌云卷走了太阳。

And when I went back to following these eight principles, the black cloud over my head disappeared altogether.

我也继续履行我的八条原则，在我头上的乌云消失了。

Yes, it is extremely hard at times to raise one's head above the suffocating black cloud when one is immersed in it;

是的，这是极为困难的时候，提出了一个个的头以上令人窒息的黑色云当一个沉浸在它；

Well, soon a black cloud formed over my head and here I was, outwardly very successful, but inwardly very depressed.

很快地，乌云罩顶，我外表看上去成功，但内心非常消沉。

Hareton grew black as a thunder cloud, at this childish speech.

哈里顿听了这一套孩子气的话，脸像阴云一般黑。

Get some sleep and spare your co-workers from having to deal with you and the black cloud that follows you all day.

保证充足的睡眠以便你的同事不用整天面对你和你那愁眉苦脸。

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！

Storm-cloud ( large black cloud coming with a storm or indicating that a storm is likely to happen) It is legitimate to envisage a more or less one-to-one correspondence between cloud nucleus concentration and the concentration of cloud droplets.

暴风云（暴风雨时出现的或预示暴风雨将至的浓密的乌云）.拟想云核浓度与云滴浓度之间有或多或少的一一对应关系是合理的。