由于干旱天气，灌木丛大火迅速蔓延，消防员们正在全力扑救。

The ___bushfire spread quickly due to the dry weather, and firefighters are working hard to contain it.

健身热潮像野火一样迅速在社交媒体上蔓延。

The fitness trend spread like a ___bushfire across social media platforms.