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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