He's an expert in aging. This horizontal axis is how old you are -- twelve years old, twenty-four years old, seventy-four, ninety-six years old -- and this is some medical data. So, brain strength increases up to 60, and then after 60, it sort of goes down. Kind of depressing in a way.
他是一个研究衰老的专家。这条水平横轴显示你的年龄－－ 20岁，24岁，70岁，96岁－－ 纵轴是一些医疗数据。所以大脑的增长一直持续到60岁， 过了60岁，大脑就开始减弱。某种意义上挺让人沮丧的。