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One key to a longer life could be a quieter brain without too much neural activity, according to a new study that examined postmortem brain tissue from extremely long-lived people for clues about what made them different from people who died in their 60s and 70s. 一项新研究表明，长寿的一个关键因素可能是大脑比较平静，且没有太多的神经活动。该研究剖检了寿命极长之人死后的脑组织，以寻找他们与六七十岁即去世之人的不同之处。 "Use it or lose it" has dominated thinking on how to protect the aging brain, and extensive research shows there are many benefits to remaining physically and mentally active as people get older. 关于如何保护衰老的大脑，“用进废退”一直主宰着人们的想法。大量研究表明，随着年龄的增长，保持身体和精神上的活跃有很多好处。 But the study, published in the journal Nature, suggests more isn't always better. Excessive activity - at least at the level of brain cells - could be harmful. 但发表在《自然》杂志上的这项研究表明，并不总是越多越好。至少过度的脑细胞活动可能是有害的。 | 
