Electricity is a very common ignition source in fires.

电气是一种很常见的火灾源头。

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This can cause a fire if an ignition source is present.

如果存在火源，这会导致起火。

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To avoid an explosion we have to avoid oxygen (from air), ignition source or higher vapour concentrations.

避免产生爆炸，应该避免氧气(空气中)，火源或高蒸汽浓度状况存在。

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Evidence revealed thus far supports the fact that the ignition source was not the Lithium-ion battery pack, new technology components or unique exhaust routing.

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As part of their investigation, Japanese and U.S. experts want to determine if an internal battery failure, or defective lithium-ion cell, was the ignition source in either of the two incidents.

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