What America needs is an environmentally friendly, logistically feasible, and economically responsible alternative fuel source.
美国需要的是一种环保的，现实可行的，合理价位的可替换燃料能源。
VO: What America needs is an environmentally friendly, logistically feasible and economically responsible alternative fuel source.
美国需要的是一个保护生态环境的，逻辑上可行的，经济上可负担得起的替代能源的资源。
By far, the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, which USES hydrogen to create electricity that, in turn, powers the car.
目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。
By far, the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, which USES hydrogen to electricity that, in turn, powers the car.
目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。
By far, the most promising alternative source of energy for cars is the hydrogen-based fuel-cell engine, which USES hydrogen to electricity that, in turn, powers the car.
目前为止，氢燃料电池发动机是最有竞争力的汽车动力代替品。氢燃料电池发动机是用氢作燃料产生电能以充当汽车的动力。
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