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- 乌云是雨或雪将至的预兆。
Dark clouds are a sign of rain or snow.
- 乌云是下雨的明显前兆。
Black clouds are an unmistakable sign of coming rain.
- 乌云密布预示着将要下雨。
The black clouds threatened rain.
- 有乌云的时候，就知道快下雨了。
When there are black clouds you can tell it's going to rain.
- 乌云压顶，来势不妙。
Those black clouds look a bit ominous.
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