Its fuel cell converts hydrogen’s energy to electricity that charges the car’s battery.

它的燃料电池将氢能转化为电能， 为汽车电池充电。

Still, some scientists are desperate to make hydrogen energy sustainable, and in recent years, efforts have more than doubled the efficiency of water electrolysis.

尽管如此，一些科学家仍迫切希望使氢能源可持续发展，近年来，他们的努力使水电解的效率提高了一倍以上。