A spark ignites the fuel in a car engine.

汽车发动机中的燃料由火花点燃。

《牛津词典》

When the Lycoming engine barked to life, it was as if a spark had jumped a gap in my heart-the love, vigor, and excitement of my childhood came rushing back.

莱康明引擎开始隆隆作响的时候，我心里仿佛有一朵火花倏地一闪——童年时的热爱、活力和激动统统回来了。

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In a diesel engine, there is no spark plug. Instead, diesel fuel is injected into the cylinder, and the heat and pressure of the compression stroke cause the fuel to ignite.

柴油发动机内没有火花塞，取而代之的是将柴油喷入发动机气缸，然后压缩冲程在高温高压下引起燃料点火。

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That fuel economy comes from sophisticated electronic fuel and spark controls, and computerized automatic transmissions teamed up with a very sophisticated engine that was designed using computer-automated design, machined using CNC milling, and assembled by robots.

FORBES: New Cars: Semiconductors and an Engine

They believe a single type of cell may be cancer's main growth engine:mutant stem cells that, though barely present, spawn other cells that then spark growth.

FORBES: Cancer Killer