clean and efficient transportation
清洁高效交通(clean and efficient transportation)
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石油燃料在几十年内逐渐耗尽，而燃料电池以其高效、清洁的特点将会成为未来交通的推动力。
Petroleum will be used up in future, fuel cell will become the major power supplier for transportation in future for its high efficiency and cleanliness.
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