在本周，德国汽车制造商宝马公司发布了一个可供选择的途径，除了通常的汽油引擎外，人们还可以选择同时带有以氢为燃料的内燃机轿车。

This week a German carmaker, BMW, revealed an alternative approach: an otherwise normal saloon car that can run with a hydrogen-powered internal-combustion engine.

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利用氢所产生的水和可再生能源，如风能、太阳或水电，内燃机，汽车的排放量是本质上不过蒸气。

By using hydrogen produced from water and renewable energy, such as wind, sun or hydropower, in an internal combustion engine, the car's emissions are essentially nothing but vapor.

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