Fries had a different hypothesis: he thought regular exercise would extend high-quality, disability-free life.

而Fries持不同观点：他认为常规锻炼会延长高质量的自主生活时间。

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Previous findings from the project, the largest study of centenarians in the world, show that 90 percent of them are free of disability to an average age of 93.

从项目之前的调查结果表明，世界上最大的百岁老人中百分之九十的无残疾的平均年龄是93岁。

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Census Bureau data suggest that Americans generally are staving off disability to the very end of life: Those at age 65 can expect that half their remaining years will be disability free.

美国人口普查局的数据显示，总的来说，美国人即使是在人生尽头也没有丧失生活和工作的能力：65岁的人可以指望今后日子中有一半时间都不会受到此类困扰。

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