她沉思着，这是这个区别：二十岁的人不知道四十年代是什么样的，而四十岁的人知道二十岁的感觉。这有点像与从未去过那里的人讨论一个外国。他们准备聆听，但这对他们来说不是很真实。
(And the difference was this, she mused: those who are twenty don't know what it is like to be forty, whereas those who are forty know what it is like to be twenty. It was a bit like discussing a foreign country with somebody who has never been there. They are prepared to listen, but it's not quite real for them.)