适宜的运动负荷能够减少机体自由基数量，提高机体抗氧化能力，延缓衰老。
Suitable movement can reduce quantity of free radical of the organism, improve the anti-oxidant ability, and therefore slow aging.
结果表明：沿等离子体从弧根到弧梢位置，OH自由基数量迅速减少，O原子数量呈现先增多后减少的规律。
The results show that the number of OH radicals decreases rapidly and the number of o atoms follows a rule of increasing firstly and then decreasing from arc root to arc tip.
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