Dry grass and trees easily catch fire.

干草和树很容易引起火灾。

youdao

The high temperatures and dry conditions make the fire spread quickly.

高温和干燥的条件使火势迅速蔓延。

youdao

The dry grass caught fire.

干草着火了。

《牛津词典》

But the tundra was very dry in 2007 and fire-fueling winds kicked up the blaze.

CNN: Next global warming worry: Thawing tundra

The area near an uphill incline is considered a collection point for fuel and ignition sources, and it's possible a piece of debris fell into the tinder-dry brush early Thursday and sparked the fire, Piranio said.

NPR: Cause Of California Wildfire Appears Accidental

The fire, which is fueled by dry brush and trees, was 30% contained Monday -- threatening structures and prompting an unspecified number of evacuations.

CNN: STORY HIGHLIGHTS