translation.en: I don't have time to talk about it today, but if you think about it, I would say that in the last 25 years, of every invention or innovation that's occurred in this country, the biggest one in terms of impact on the well-being of people who live in the inner city, was crack cocaine.
translation.zh: 我今天没空说这个了。 如果你去想一想，我会说在过去二十五年， 这个国家的所有发明创新中， 对城市人们生活状态影响最大的， 就是快克。