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.
新款引擎的燃料空气压缩率高达14比1，而一般的引擎只有10比1。
Still, the new engine gets a 14-to-1 ratio for fuel-air compression, compared with the more common 10-to-1 ratio for engines.
常规燃烧只存在于理想的燃料空气比中，叫作可燃性界限。
Conventional combustion can only exist within well-defined fuel to air ratios, known as the flammability limits.
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