Already there are many alternative fuel vehicles on the market, powered by anything from solar power to natural gas.

市场上已经有很多替代燃料汽车，其动力来源从太阳能到天然气无所不包。

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Cars powered by gasoline were sold for many years before hybrid vehicles that use gasoline, electricity, and solar energy. Car companies are now making cars that are fully powered by electricity only.

在使用汽油、电力和太阳能的混合动力汽车出现之前，汽油动力汽车已经销售了很多年。汽车公司现在正在生产完全由电力驱动的汽车。

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In particular, the Department of Energy frets about certain metals used in manufacturing wind turbines, electric vehicles, solar cells and energy-efficient lighting.

这种焦虑在美国能源部尤其严重，能源部对用于生产风力发电机涡轮、电动汽车、太阳能电池和节能灯的特殊材料的缺少感到特别揪心。

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Johanson of Solar Electric Vehicles said he'd like to see Toyota bring the weight of a Prius down from 3, 000 pounds to 2, 000.

CNN: Solar cars still a way off

Billy Bautista, a project coordinator at the company, said Solar Electric Vehicles gets so many requests for the system that there is a backlog of several months.

CNN: Solar cars still a way off

Greg Johanson, president of Solar Electric Vehicles in Westlake Village, California, said his company makes a roof-mounted panel for a standard Prius that enables the car to travel up to 15 additional miles a day.

CNN: Solar cars still a way off