And while hydrogen is touted as the fuel of the future, at best it is decades away.
而且，虽然氢气被吹捧为未来的燃料，但按照最乐观的估计，这也是几十年后的事了。
Natural gas is considered as one of the potential fuels for engine while hydrogen is considered as one of the cleanest fuels for engine.
天然气和氢气被认为是最有潜力和最清洁的发动机替代燃料。
Natural gas is considered as one of the potential fuels for engine while hydrogen is considered as one of the cleanest fuels for engine.
天然气和氢气被认为是最有潜力和最清洁的发动机替代燃料。
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