几个小时之后，佣兵们发现自己陷入了一个糟糕的位置，一部分人希望借助飞机离开，而这需要燃料。
After several hours, the mercenaries found themselves in an unfavorable position and some wanted to depart on the aircraft, which needed fuel.
广泛的以电力为驱动的空中旅行很不现实：飞机发动机需要高密度的能量，而这些只有化学燃料才可提供。
There is no realistic prospect for widespread electric air travel: the jet engines on aircraft need the high-energy density that only chemical fuels can provide.
因为那将需要每一个农民供养近两个单位的城市居民，而这将受阻于化肥、农场机械以及燃料的短缺。
That would require every farmer to sustain nearly two city dwellers, which a shortage of fertiliser, farm machinery and fuel precludes.
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