Carelessness is the usual cause of fire.

疏忽大意通常是火灾的起因。

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The most important natural cause of fire is lighting.

自然界最主要的引火物质是闪电。

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First, burning firecrackers is a potential cause of fire accidents, especially in the big city.

首先，放鞭炮是火灾事故潜在的原因，特别是在大城市。

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Then on April thirtieth, two thousand seven,a huge fire of unknown cause almost completely destroyed South Hall.

VOA: special.2009.08.21

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 Scottish Fire and rescue Service said the cause of fire was not yet known.

BBC: Firefighters tackle blaze at Stirling Superglass factory

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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