... 氢气过压 hydrogenexcesspressure 氢气飞机 hydroaeroplane 氢气纯度 hydrogenpurity ; Hot start ...
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氢气比空气轻，但是将它经压缩存储在燃料箱中并添加所有必需设备后飞机又变重了。
Hydrogen is lighter than air, but compressing it, storing it in tanks and adding all the necessary equipment starts to tip the scales towards heavy again.
交通：它们都是使用燃料电池的汽车，飞机（使用从核植物中提取氢气）和磁悬浮列车。
TRANSPORTATION: It’s all fuel-cell cars and planes (using hydrogen from the nuclear plants) and maglev trains.
最便宜的方案是使用巨型空中加油飞机——例如美国空军的KC-10“补充者”空中加油机（KC-10 Extender），装满二氧化硫和硫化氢气体。
The cheapest option could be to use giant mid-air refuelling aircraft, such as the US air force's KC-10 Extender, filled with sulphur dioxide or hydrogen sulphide gas.
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