translation.en: But look, this is the world my teacher talked about in 1960: one billion Western world here -- high child-survival, small families -- and all the rest, the rainbow of developing countries, with very large families and poor child survival.
translation.zh: 看，这就是我老师口中的1960年的世界。 西方国家一个亿， 高儿童存活率，小家庭。 和所有其他， 其他五彩斑斓的发展中国家， 都有大的家庭 和很低的儿童存活率。