那位疲惫的老人蹒跚而行。
不过，变成超级老人的道路并不平坦，因为这些脑部区域有另外一个有趣的属性：当它们的活动增加时，你会觉得非常糟糕——疲惫，为难，沮丧。
The road to superaging is difficult, though, because these brain regions have another intriguing property: When they increase in activity, you tend to feel pretty bad — tired, stymied, frustrated.
看看他，一个疲惫，虚弱的老人，很难想象他曾经是个出色的运动员。
Look at him now, a tired, weak old man; it's difficult to imagine that he was once a great athlete.
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