这种情况发生的原因是身体机能接触氧后产生的副产物自由基的释放，自由基是一类具有高活性的分子，对人体具有巨大的威胁。
This happens because of exposure to free radicals, highly reactive molecules that are byproducts of bodily functions involving oxygen (which is just about all of them).
氧化损伤，或氧化应激，出现在被称为自由基的高活性分子攻击和破坏细胞蛋白质，脂类(脂肪)和脱氧核糖核酸时。
Oxidant injury, or oxidative stress, occurs when highly reactive molecules called free radicals attack and damage cellular proteins, lipids (fats) and DNA.
化学活性高的自由基可使不饱和脂肪酸过度氧化，使细胞功能突变或衰退，引起组织增殖和坏死而产生置人于死地的疾病。
Chemistry high activity of free radicals can make the unsaturated fatty acid oxidation, making the cell function excessively, or recession mutations and proliferation and necrosis centralis disease.
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