研究人员说，汽车发动机很快将由激光器来引燃，从而取代火花塞。

Car engines could soon be fired by lasers instead of spark plugs, researchers say.

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在一辆密封的公交车上，如果燃气发生泄漏达到一定密度并有火花引燃就可能造成一场大火。

A gas leak aboard a sealed bus could cause a major fire if it grew dense enough and was ignited by a spark.

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有时候，一个小火花会引燃巨大能量。

Sometimes, just a small spark to ignite the powder.

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