Higher ratios can be used with more exotic fuels.
采用较特殊燃料时，可以采用较高的压缩比。
One might think that fusion propulsion requires some exotic fuel to propel a rocket a million-or-so-times more energetically than standard chemical fuels.
有人可能会认为聚变推进需要一些能量高于标准的化学燃料一百多万倍的稀有燃料推进一个火箭。
The Earth holds other, less-accessible fuels, such as tar sands, and a more exotic possibility in the form of icy methane hydrates.
地球中还有其他不那么容易开采的燃料，如焦油砂，以及更引入注目的可燃冰。
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