element 56
元素56
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"Even if I knew for sure that running fast had an element of risk, I don't know that I would back down, " said Foiles, the 56-year-old runner who lives in a Kansas City suburb.
WSJ: Endurance Sports: Studies on Older Endurance Athletes Suggest the Fittest Reap Few Health Benefits
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