还不明确的是，为什么当我们变老的时候这个开关会关上。
What’s not clear is why the switch flips “off” as we get older.
很多人相信压力对我们的大脑有害尤其当我们变老的时候。
Many believe that stress is bad for our brains especially as we get older.
还不明确的是，为什么当我们变老的时候这个开关会关上。
What's not clear is why the switch flips "off" as we get older.
这意味着当我们变老的时候我们需要更多的依赖日记或其他手段，我么需要花费更多的时间去学习新的语言，掌握工作中的新信息。
This means we have to depend more on diaries and other mental aids as we get older, take longer to learn a new language and are slower to master new things at work.
这意味着当我们变老的时候我们需要更多的依赖日记或其他手段，我么需要花费更多的时间去学习新的语言，掌握工作中的新信息。
This means we have to depend more on diaries and other mental aids as we get older, take longer to learn a new language and are slower to master new things at work.
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