乌云 烏雲
wū yún
HSK level: HSK 7–9
Meaning
black cloud
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Examples
天空乌云密布。
tiān kōng wū yún mì bù。
The sky is full of dark clouds.
乌云是下雨的征兆。
wū yún shì xià yǔ de zhēng zhào。
Dark clouds are a sign of rain.