The inexpensive extra-virgin oil started to smell of rubber and plastic almost as soon as it became warm, and fumed at 350 degrees.

便宜的特级纯橄榄油一加热到350度时就冒烟，并开始产生一种橡胶和塑料的气味。

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The team assumed that Virgin Galactic's rubber-burning engine would emit 60 grams of black carbon per kilogram of fuel burned.

小组只是假设维珍银河号的橡胶燃料引擎，每燃烧1千克的燃料会释放60克黑碳。

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