It is the vapors that come out of the gas that cause the fire, when connected with static charges.

这是蒸汽的来出的气体引起火灾，与静电有关。

youdao

The cause of the fire is not yet known.

火灾的原因尚不清楚。

《牛津词典》

There was discussion about the fire and its likely cause.

对那场火灾及其可能的起因进行了讨论。

《牛津词典》

Cause she's been through the fire before And I believe she can take a whole lot more.

VOA: special.2010.07.02

Any new heat or fire could cause the leaking well and the surrounding area to explode.

VOA: special.2009.03.22

Indonesia is on the so-called Pacific Ring of Fire where several tectonic plates meet and often cause earthquakes.

VOA: standard.2009.09.03

The Fire and Rescue Service has returned to the scene to begin an investigation into the cause of the fire, but said earlier it did not believe there were any suspicious circumstances.

BBC: Man dies in Ballymoney house fire

West Bengal Chief Minister Mamata Banerjee said police and fire officials have been ordered to investigate the cause of the fire and submit their reports within three days.

WSJ: At Least 19 Killed in Kolkata Fire in India

Fire investigators are searching for evidence to establish the cause of the fire, which broke out shortly before 1330 GMT.

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