早期的老鼠试验已经发现紧张性运动会增加上呼吸道感染的易感性，尽管还不是很清楚对人类是否同样正确。
Earlier mouse studies have found that stressful exercise can increase susceptibility to upper respiratory infections, although it is not yet clear if the same is true for humans.
该研究同时也发现紧张性的运动会增加老鼠对流感的易感性，但槲皮素抵消了那种负面作用。
The study also found that stressful exercise increased the susceptibility of mice to the flu, but quercetin canceled out that negative effect.
经过激烈竞赛的紧张锻炼和严峻的考验，他们的力量、耐力和纪律性都得到了增强，他们学会了如何尊重采自许多国家的运动员并且与之合作。
By undergoing the stress and strain of tough competition, they grow in strength, endurance, discipline. They learn to respect and to cooperate with people from many nations.
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