游离氧（Free oxygen）是自由基。处在游离状态下的氧，周围需有一个化学氛围，才能算是游离，单质情况的氧。比如在管中的游离氧如氧气，臭氧，游离氧有较强的氧化作用，可以有效杀死多数有害细菌，其实这也是双氧水的消毒原理。
多亏有了绿色植物，空气中充满了游离氧。
It is thanks to the green plants that the air is full of free oxygen.
结论麻风杆菌需要靠SOD所产生的游离氧残基来防止宿主的破坏，从而SOD活性降低。
Conclusion That leper needs the free acid residue produced by SOD prevents host's destruction, result the SOD activity is lower.
由于铝总是和其他元素结合在一起，最常见的是和氧结合，所以在自然界中找不到游离的铝。
Nowhere in nature is aluminum found free, owing to its always being combined with other elements, most commonly with oxygen.
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