I mean post 911 we had circumstances that a lot of people, unless you're actually dealing with it, you wouldn't really be able to understand what people are going through.

11之后我们的情况是,除非你真的在应对这件事,许多人都不是真的，能够了解,我们经历了什么。

普林斯顿公开课 - 人性课程节选

Too many changes have happened to society and the world we live in for a 50-year-old to be able to relate to a 15-year-old and the stock put-down phrase adopted by all kids "you wouldn't understand" is perfectly appropriate - though very unwelcome at any age.

BBC: NEWS | UK | Scotland | Parents in their 20s? No kidding!