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英语翻译Earlier scientists thought that during a man’s lifetime

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英语翻译
Earlier scientists thought that during a man’s lifetime the power of his brain decreased.But it is now thought that this is not so.As long as the brain is given plenty of exercise it keeps its power.It has been found that an old person who has always been mentally active has a quicker mind than a young person who has done only physical work.It is now thought that the more work we give our brains,the more work they are able to do.
英语翻译Earlier scientists thought that during a man’s lifetime
早期的科学家们认为,在人的一生中,大脑的运作能力是逐渐减弱的.但是现在,这种观念遭到了怀疑.现代的观点认为,只要大脑运用的足够,那么它就能保持它的运作能力.研究发现,一个长期从事脑力劳动的老年人甚至比一个仅仅从事体力劳动的年青人的思维速度还要快.现代科学认为,我们大脑的工作量越大,越能胜任更多的事情.