The people of the world will drive some two billion cars by 2030, up from roughly 700 million today.

目前世界上约有7亿辆汽车行驶在我们的地球上，到了2030年，这个数字可能要达到20亿。

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The number of cars worldwide will rise from one billion to two billion.

全球汽车的使用量将从10亿辆攀升到20亿辆。

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The global carbon footprint from spam annually is equivalent to the greenhouse gases pumped out by 3.1 million passenger cars using two billion gallons of gasoline in a year.

每年全球垃圾邮件的碳排放量相当于310万辆客车每年消耗20亿加仑的汽油所排出的二氧化碳。

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"Two-point-four billion dollars in highly competitive grants to develop the next generation of fuel-efficient cars and trucks, powered by the next generation of battery technologies all made right here in the U.S.of A,"

VOA: standard.2009.08.05