一个处理方法是将它们在没有氧气或者氧气稀薄的情况下烘干。
One way of dealing with them is to dry them and then heat them with little or no oxygen present.
有人说，在这种氧气稀薄的高处，施行救援太危险。
Some say that at such oxygen-deprived altitudes , rescues are too perilous .
麻烦的是，高海拔的地段，氧气稀薄，螺旋桨叶片没有空气使其扇动，而且发动机燃烧汽油也需要氧气。
The trouble was that at high altitudes where there is less oxygen, the propeller blades had little air to bite and engines still needed oxygen to burn petrol.
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