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》

The very act of acknowledging that they are African-Americans when given a test ignites in them thoughts of their own stereotype which is negative regarding academics and that makes them do worse.

在测试中承认他们是非裔美国人的行为会激发他们对自己的刻板印象的思考，而这种刻板印象会对学术人士造成负面影响，使他们做得更差。

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The very act of acknowledging that they are African-American when given a test ignites in them thoughts of their own stereotype, which is negative regarding academics and that makes them do worse.

他们在测试中承认自己是非裔美国人的行为会激发他们内心对自身刻板印象的思考，而这种印象在学术方面是负面的，令他们表现得更差。

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My contention is rather simple: Real pyrotechnics happen in Silicon Valley when an imaginative entrepreneur, often not a super-geek, ignites an idea and sets a truly unique brand agenda.

FORBES: Brand-Building in Silicon Valley

When the silence of an empty room ignites a visceral impending doom reaction, challenge why you shudder out of terror.

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If the flight is only partly successful, it still promises to be the "spark that ignites a thriving industry, " former astronaut Michael Lopez-Alegria, president of a trade group pushing such projects, told reporters said Thursday.

WSJ: SpaceX's Pioneering Flight Plans