This would be difficult to explain if oxygen levels fell below 15 per cent, as Berner's model suggests, because fires should not occur below this level.
伯奈尔的模型暗示,如果含氧量降到15%,这情况会很难想象,因为火在那样的含氧量条件下是不能燃烧的。
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Cameras and an inspection team spotted the bat clinging to the side of Discovery?s 15-story external tank as it was being fueled with propellant ? super-cold liquid hydrogen and liquid oxygen.