人们都说，乌云是下雨的征兆。

Dark clouds are said to be a sign of rain.

youdao

乌云是下雨的征兆吗？

Are dark clouds a sign of rain?

youdao

乌云是下雨的征兆。

The dark clouds mean rain.

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红色的天空是好天气的征兆，而乌云则是下雨的征兆。

Red sky is a sign of good weather, but black clouds are a sign of rain.

youdao

乌云往往是下雨的征兆。

Dark clouds are usually a sign of rain.

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那些乌云是天要下雨的可靠征兆。

Those black clouds are a sure sign it's going to rain.

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那些乌云是天要下雨的可靠征兆。

Those black clouds are a sure sign it's going to rain.

youdao