根据SPACE.com网的报道，这一次，“卡西尼”号探测器在土卫五北极表面97千米高的上空中漫游时有机会一“嗅”其的氧气。
This time, Cassini's instrument had the chance to "smell" that oxygen, as it flew through it over Rhea's north pole, just 97 kilometres above the surface, according to the details given on Space.com.
当被测气体的环境氧气含量较低，或者含有易使催化元件中毒的某些背景气体时，催化燃烧原理探测器的使用就受到了一定的限制。
When the detectors are used to measure the gas of low oxygen environment, or certain background gas which can easily poisoned the catalyze components, they have certain limits.
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