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.

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一种测量方法是测量这颗行星的光谱，这样可以探测到其大气中是否有氧气或其他生命迹象。

One way to find out would be to measure the planet's light spectrum, which could reveal molecular oxygen or other possible signs of life in its atmosphere.

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比如，细菌能够探测到氧气。

Bacteria can detect oxygen, for example.

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