病毒蔓延到全球，引起了严重的卫生危机。

Bìngdú mànyán dào quánqiú, yǐnqǐle yánzhòng de wèishēng wēijī.

The virus spread globally, causing a serious public health crisis.

恶劣的天气使问题蔓延到整个地区。

Èliè de tiānqì shǐ wèntí mànyán dào zhěnggè dìqū.

The bad weather caused the problem to spread throughout the entire region.

火势蔓延得非常迅速，令人惊恐不已。

Huǒshì mànyán dé fēicháng xùnsù, lìng rén jīngkǒng bù yǐ.

The fire spread very quickly, causing great fear.