In areas with heavy automobile traffic, however, the seed germinates in the absence of fire, with automobile exhaust supplying the required nitrogen dioxide.

然而，在汽车交通繁忙的地区，种子在没有火灾的情况下借助汽车尾气提供所需的二氧化氮发芽。

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Massive stars end their lives with supernova explosions that spray the heavy elements into space, where they are incorporated into the next generation of stars and help seed the formation of planets.

大质量恒星在超新星爆发中结束了自己的生命并将重元素喷洒进太空中，它们将在那里重新结合成下一代的恒星及其周围的行星。

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Was tearing from her curls the seed-pearl ornament set in heavy gold which had been in the family for generations.

一面在拉扯鬈发上那件世代相传的镶嵌珍珠的金头饰。

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Wawrinka came into Sunday's match as a heavy underdog against the fourth seed, who was tipped by most to challenge for a first Grand Slam title over the next week.

BBC: Stanislas Wawrinka beats Andy Murray at US Open