Over a span of 20 years, the researchers studied a group of 241 healthy elderly volunteers, giving them regular tests designed to measure their thinking or cognitive powers.
在长达20年时间里，研究人员们对241位老年志愿者进行研究，一定时间的对他们进行测试然后对他们的思维和认知力进行检测。
Over a span of 20 years, the researchers studied a group of 241 healthy elderly volunteers, giving them regular tests designed to measure their thinking or cognitive powers.
在长达20年时间里，研究人员们对241位老年志愿者进行研究，一定时间的对他们进行测试然后对他们的思维和认知力进行检测。
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