The Eskimos produced a slow - burning spark by striking quartz against iron pyrites.

爱斯基摩人利用硫化铁矿石击打石英获得缓慢燃烧的火花.

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This device has been specially designed for lighting slow burning torches.

这装置已经被特殊地设计来点亮缓慢燃烧的火把.

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The earliest people probably stored fire by keeping slow burning logs alight.

早期的人类可能通过让燃烧缓慢的原木保持燃烧状态来保存火种.

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