"Maybe the reason why free radicals and aging are correlated is because free radical production in the mitochondria (part of the cell) is a stress reaction to the damage of aging," Hekimi said.
海克米说：“人们之所以把自由基和衰老联系在一起，可能是因为自由基在线粒体(细胞的一部分)中产生是人体对衰老的应激反应。”
If the stress of aging or disease increases sufficiently, he said, the damage caused by the free radicals might overwhelm their positive effects.
如果衰老或疾病过程中的应激大幅增加的话，自由基的破坏作用可能就会大于其积极作用。
To simulate aging, the same bees were then placed in plastic tubes and exposed to a high-oxygen environment, a metabolic stress test.
为模拟老化，把条件相同的蜜蜂放在塑胶管中，暴露于高氧环境进行代谢性应激试验。
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