Cotton socks can also provide you with a source of fire-starting tinder.

棉布袜还可以提供点火用的火绒。

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Wildfires that produce a lot of smoke are difficult to manage because the source of fire can be hard to see.

森林大火往往产生大量的浓烟，大火很难控制是因为很难找到火源。

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The emphases sare on the reduced content level of system oxygen and controlled source of fire.

重点是降低系统含氧浓度和控制火源。

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Israeli television said soldiers had failed to locate the source of fire and at first shot back in the wrong direction.

BBC: Israel to step up military operations

"They believed they were coming under attack from that side of the border, " a senior U.S. official said, although investigators have yet to pinpoint the precise source of fire.

WSJ: Airstrike Ravages U.S.-Pakistan Ties

The toaster was not faulty but was a probable source of the fire.

BBC: Essex